Add job to create issue when nightly build fails

[Nemo157]

bors r+

[codecov[bot]]

Codecov Report

Merging #8 (321818e) into prīmum (4dbbcc9) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           prīmum       #8   +/-   ##
=======================================
  Coverage   58.53%   58.53%           
=======================================
  Files          31       31           
  Lines         832      832           
=======================================
  Hits          487      487           
  Misses        345      345           

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[bors[bot]]

Build succeeded:

• cargo audit
• cargo clippy
• cargo hack check --feature-powerset
• cargo +nightly doc --cfg docsrs
• cargo +nightly fmt --check
• cargo test
• cargo test (stable, i686-pc-windows-msvc, windows-latest)
• cargo test (stable, i686-unknown-linux-gnu, ubuntu-latest)
• cargo test (stable, x86_64-apple-darwin, macos-latest)
• cargo test (stable, x86_64-pc-windows-msvc, windows-latest)
• cargo test (stable, x86_64-unknown-linux-gnu, ubuntu-latest)