Problems building with circleci

[previ]

Hello I am having problems using the provided circleci CI script.

I get many errors in the test job:

#!/bin/bash -eo pipefail
cargo clippy -- -D warnings
bin: wifi-connect
    Updating registry `https://github.com/rust-lang/crates.io-index`
 Downloading serde v1.0.145
 Downloading serde_json v1.0.85
 Downloading persistent v0.4.0
 Downloading iron-cors v0.8.0
 Downloading mount v0.4.0
 Downloading env_logger v0.9.1
 Downloading staticfile v0.5.0
 Downloading network-manager v0.11.0
 Downloading serde_derive v1.0.145
 Downloading clap v2.34.0
 Downloading nix v0.24.2
 Downloading iron v0.6.1
 Downloading router v0.6.0
 Downloading params v0.8.0
 Downloading error-chain v0.12.4
 Downloading ryu v1.0.11
 Downloading itoa v1.0.4
 Downloading plugin v0.2.6
 Downloading num_cpus v1.13.1
 Downloading typemap v0.3.3
 Downloading modifier v0.1.0
 Downloading hyper v0.10.16
 Downloading url v1.7.2
 Downloading mime_guess v1.8.8
 Downloading unsafe-any v0.4.2
 Downloading traitobject v0.1.0
 Downloading log v0.4.17
 Downloading cfg-if v1.0.0
 Downloading time v0.1.44
 Downloading unicase v1.4.2
 Downloading mime v0.2.6
 Downloading httparse v1.8.0
 Downloading typeable v0.1.2
 Downloading language-tags v0.2.2
 Downloading base64 v0.9.3
 Downloading libc v0.2.134
 Downloading version_check v0.1.5
 Downloading idna v0.1.5
 Downloading matches v0.1.9
 Downloading unicode-normalization v0.1.22
 Downloading unicode-bidi v0.3.8
 Downloading tinyvec v1.6.0
 Downloading tinyvec_macros v0.1.0
 Downloading byteorder v1.4.3
 Downloading safemem v0.3.3
 Downloading phf v0.7.24
 Downloading phf_shared v0.7.24
 Downloading siphasher v0.2.3
 Downloading phf_codegen v0.7.24
 Downloading phf_generator v0.7.24
 Downloading rand v0.6.5
 Downloading rand_isaac v0.1.1
 Downloading rand_xorshift v0.1.1
 Downloading rand_os v0.1.3
 Downloading rand_jitter v0.1.4
 Downloading rand_chacha v0.1.1
 Downloading rand_hc v0.1.0
 Downloading rand_pcg v0.1.2
 Downloading rand_core v0.4.2
 Downloading rand_core v0.3.1
 Downloading autocfg v0.1.8
 Downloading autocfg v1.1.0
 Downloading sequence_trie v0.3.6
 Downloading termcolor v1.1.3
 Downloading regex v1.6.0
 Downloading humantime v2.1.0
 Downloading atty v0.2.14
 Downloading aho-corasick v0.7.19
 Downloading regex-syntax v0.6.27
 Downloading memchr v2.5.0
 Downloading futures v0.1.31
 Downloading dbus v0.5.4
 Downloading tokio-timer v0.1.2
 Downloading futures-cpupool v0.1.8
 Downloading ascii v0.8.7
 Downloading bitflags v1.3.2
 Downloading libdbus-sys v0.1.5
 Downloading pkg-config v0.3.25
 Downloading slab v0.3.0
 Downloading syn v1.0.102
 Downloading quote v1.0.21
 Downloading proc-macro2 v1.0.46
 Downloading unicode-ident v1.0.4
 Downloading strsim v0.8.0
 Downloading unicode-width v0.1.10
 Downloading vec_map v0.8.2
 Downloading textwrap v0.11.0
 Downloading route-recognizer v0.1.13
 Downloading tempdir v0.3.7
 Downloading urlencoded v0.6.0
 Downloading num v0.1.42
 Downloading multipart v0.13.6
 Downloading bodyparser v0.8.0
 Downloading remove_dir_all v0.5.3
 Downloading rand v0.4.6
 Downloading num-integer v0.1.45
 Downloading num-complex v0.1.43
 Downloading num-traits v0.2.15
 Downloading num-iter v0.1.43
 Downloading num-rational v0.1.42
 Downloading num-bigint v0.1.44
 Downloading rustc-serialize v0.3.24
 Downloading buf_redux v0.6.3
 Downloading twoway v0.1.8
 Downloading rand v0.3.23
 Downloading safemem v0.2.0
 Downloading memchr v1.0.2
 Downloading version_check v0.9.4
 Downloading ansi_term v0.12.1
 Downloading memoffset v0.6.5
   Compiling bitflags v1.3.2
   Compiling serde_json v1.0.85
   Compiling humantime v2.1.0
   Compiling unicode-width v0.1.10
   Compiling itoa v1.0.4
   Compiling version_check v0.9.4
   Compiling serde_derive v1.0.145
   Compiling route-recognizer v0.1.13
   Compiling quote v1.0.21
   Compiling matches v0.1.9
   Compiling unicode-bidi v0.3.8
   Compiling vec_map v0.8.2
   Compiling regex-syntax v0.6.27
   Compiling httparse v1.8.0
   Compiling modifier v0.1.0
   Compiling serde v1.0.145
   Compiling ryu v1.0.11
   Compiling rand_core v0.4.2
   Compiling remove_dir_all v0.5.3
   Compiling tinyvec_macros v0.1.0
   Compiling siphasher v0.2.3
   Compiling syn v1.0.102
   Compiling language-tags v0.2.2
   Compiling safemem v0.3.3
   Compiling rustc-serialize v0.3.24
   Compiling autocfg v1.1.0
   Compiling unicode-ident v1.0.4
   Compiling typeable v0.1.2
   Compiling proc-macro2 v1.0.46
   Compiling percent-encoding v1.0.1
   Compiling cfg-if v1.0.0
   Compiling version_check v0.1.5
   Compiling strsim v0.8.0
   Compiling memchr v2.5.0
   Compiling termcolor v1.1.3
   Compiling byteorder v1.4.3
error: :vis fragment specifier is experimental and subject to change (see issue #41022)
   --> /root/.cargo/registry/src/github.com-1ecc6299db9ec823/bitflags-1.3.2/src/lib.rs:353:9
    |
353 |         $vis:vis struct $BitFlags:ident: $T:ty {
    |         ^^^^^^^^
    |
    = help: add #![feature(macro_vis_matcher)] to the crate attributes to enable

error: underscore lifetimes are unstable (see issue #44524)
  --> /root/.cargo/registry/src/github.com-1ecc6299db9ec823/humantime-2.1.0/src/duration.rs:54:42
   |
54 |     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
   |                                          ^^
   |
   = help: add #![feature(underscore_lifetimes)] to the crate attributes to enable

error: `..=` syntax in patterns is experimental (see issue #28237)
   --> /root/.cargo/registry/src/github.com-1ecc6299db9ec823/humantime-2.1.0/src/duration.rs:112:17
    |
112 |                 '0'..='9' => {
    |                 ^^^^^^^^^
    |
    = help: add #![feature(dotdoteq_in_patterns)] to the crate attributes to enable

error: `..=` syntax in patterns is experimental (see issue #28237)
   --> /root/.cargo/registry/src/github.com-1ecc6299db9ec823/humantime-2.1.0/src/duration.rs:162:21
    |
162 |                     '0'..='9' => {
    |                     ^^^^^^^^^
    |
    = help: add #![feature(dotdoteq_in_patterns)] to the crate attributes to enable

error: `..=` syntax in patterns is experimental (see issue #28237)
   --> /root/.cargo/registry/src/github.com-1ecc6299db9ec823/humantime-2.1.0/src/duration.rs:168:21
    |
168 |                     'a'..='z' | 'A'..='Z' => {
    |                     ^^^^^^^^^
    |
    = help: add #![feature(dotdoteq_in_patterns)] to the crate attributes to enable

error: `..=` syntax in patterns is experimental (see issue #28237)
   --> /root/.cargo/registry/src/github.com-1ecc6299db9ec823/humantime-2.1.0/src/duration.rs:168:33
    |
168 |                     'a'..='z' | 'A'..='Z' => {
    |                                 ^^^^^^^^^
    |
    = help: add #![feature(dotdoteq_in_patterns)] to the crate attributes to enable

error: `..=` syntax in patterns is experimental (see issue #28237)
   --> /root/.cargo/registry/src/github.com-1ecc6299db9ec823/humantime-2.1.0/src/duration.rs:181:21
    |
181 |                     '0'..='9' => {
    |                     ^^^^^^^^^
    |
    = help: add #![feature(dotdoteq_in_patterns)] to the crate attributes to enable

error: `..=` syntax in patterns is experimental (see issue #28237)
   --> /root/.cargo/registry/src/github.com-1ecc6299db9ec823/humantime-2.1.0/src/duration.rs:187:21
    |
187 |                     'a'..='z' | 'A'..='Z' => {}
    |                     ^^^^^^^^^
    |
   [about 2000 lines more]

I guess there must be some kind of misconfiguration, even if the repo is identical to ustream, at the moment.

[previ]

Update: I was able to complete the build vis circleci by creating a branch from tag v4.4.6.

Apparently, later changes break the CI build scripts / docker imaged used by scripts.