Re-enable code coverage using codecov

[PROFeNoM]

Description

This PR brings back code coverage using codecov.

• CODECOV_TOKEN added to CircleCI > Project Settigns > Environment Variables
• Add the CODECOV_TOKEN project environment variable to the docker image
  • Also added CIRCLE_PROJECT_USERNAME and CIRCLE_PROJECT_REPONAME, as they are required when setting the slug (<org>/<repo>)
  • Also added CI and CIRCLECI, as they are required to properly detect CircleCI as the CI provider
• Generate a codecov PR comment
• Create different flags for appsec & the tracer (extension)
• Consider adding integrations (+ corresponding flag) coverage

You can see a sample report below.

One limitation of this coverage is that functions written in the extension but solely tested in PHP (I don't think of any out of my head, but hypothetically) would be considered uncovered.

Reviewer checklist

• Test coverage seems ok.
• Appropriate labels assigned.

[codecov-commenter]

Codecov Report

Merging #2464 (9c32ab3) into master (26f13b8) will increase coverage by 0.40%.
Report is 1249 commits behind head on master.
The diff coverage is n/a.

❗ Current head 9c32ab3 differs from pull request most recent head 5726c5b. Consider uploading reports for the commit 5726c5b to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2464      +/-   ##
============================================
+ Coverage     79.32%   79.73%   +0.40%     
- Complexity        0      216     +216     
============================================
  Files           125      104      -21     
  Lines         12713    12669      -44     
============================================
+ Hits          10085    10102      +17     
+ Misses         2628     2567      -61     

Flag	Coverage Δ
tracer-extension	79.73% <ø> (?)
tracer-integrations	79.86% <ø> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

see 180 files with indirect coverage changes

---

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[bwoebi]

Note: add gpg to base buster container.
Maybe just include it already in dockerfile.

[bwoebi]

We test ... that no dot is in the resource name because they're prefixed arm.... right.

[bwoebi]

spaces as indents here?

[bwoebi]

Looking good :-)

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-01-16 16:19:21

Comparing candidate commit 5726c5b in PR branch alex/fix/coverage with baseline commit ba0cf68 in branch master.

Found 0 performance improvements and 1 performance regressions! Performance is the same for 40 metrics, 49 unstable metrics.

scenario:PHPRedisBench/benchRedisBaseline

• 🟥 execution_time [+172.070µs; +341.458µs] or [+6.286%; +12.473%]