CI: adopt matrix syntax

[vemv]

Brief

The project's build matrix predates CircleCI's matrix syntax. By using it, the build file can grow more sustainably - in particular we can add more elements / dimensions without having to review/adapt everything.

QA plan

Build this branch and observe that each named job is different and actually results in different setups/commands being executed.

Author checklist

• [x] I have QAed the functionality
• [x] The PR has a reasonably reviewable size and a meaningful commit history
• [ ] I have run the branch formatter and observed no new/significative warnings
• [x] The build passes
• [x] I have self-reviewed the PR prior to assignment
• Additionally, I have code-reviewed iteratively the PR considering the following aspects in isolation:
  • [x] Correctness
  • [x] Robustness (red paths, failure handling etc)
  • [ ] Test coverage
  • [ ] Spec coverage
  • [x] Documentation
  • [x] Security
  • [x] Performance
  • [x] Breaking API changes
  • [x] Cross-compatibility (Clojure/ClojureScript)

Reviewer checklist

• [ ] I have checked out this branch and reviewed it locally, running it
• [ ] I have QAed the functionality
• [ ] I have reviewed the PR
• Additionally, I have code-reviewed iteratively the PR considering the following aspects in isolation:
  • [ ] Correctness
  • [ ] Robustness (red paths, failure handling etc)
  • [ ] Test coverage
  • [ ] Spec coverage
  • [ ] Documentation
  • [ ] Security
  • [ ] Performance
  • [ ] Breaking API changes
  • [ ] Cross-compatibility (Clojure/ClojureScript)

[thumbnail]

Is there something we can do about the jobnames? The jobnames overflow in the CircleCI interface, so they required to be opened before it's clear what the job configuration is. It's kinda messy.

Do like the transition to matrices though 🚀 !

[vemv]

Is there something we can do about the jobnames?

Following the docs, it looked like this would work:

diff --git a/.circleci/config.yml b/.circleci/config.yml
index be723e4..4982fe0 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -99,6 +99,7 @@ workflows:
           matrix:
             <<: *test_code_filters
             alias: "test_code_base"
+            name: "Serial - << matrix.jdk_version >> - << matrix.lein_test_command >>" 
             parameters:
               jdk_version: ["openjdk8","openjdk11"]
               lein_test_command:
@@ -109,6 +110,7 @@ workflows:
       - test_code:
           matrix:
             <<: *test_code_filters
+            name: "Parallel - << matrix.jdk_version >> - << matrix.lein_test_command >>"
             alias: "test_code_parallel_eastwood"
             parameters:
               jdk_version: ["openjdk8-parallel", "openjdk11-parallel"]

however I don't see a change in the UI