Add concurrency to the GitHub workflows to auto-cancel older runs of actions in PRs.

[langleyd]

Resolves #5327

[github-actions]

Matrix SDK

Integration Tests Results:

• [org.matrix.android.sdk.session]
  passed="25" failures="17" errors="0" skipped="2"
• [org.matrix.android.sdk.account]
  passed="5" failures="0" errors="0" skipped="2"
• [org.matrix.android.sdk.internal]
  passed="158" failures="12" errors="0" skipped="38"
• [org.matrix.android.sdk.ordering]
  passed="16" failures="0" errors="0" skipped="0"
• [org.matrix.android.sdk.PermalinkParserTest]
  passed="2" failures="0" errors="0" skipped="0"

[github-actions]

Unit Test Results

  84 files  ±0    84 suites  ±0   1m 4s ⏱️ +12s
157 tests ±0  157 ✔️ ±0  0 💤 ±0  0 ❌ ±0 
504 runs  ±0  504 ✔️ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit c61af45. ± Comparison against base commit 8d5d064.

♻️ This comment has been updated with latest results.

[michaelkaye]

Intent of PR is great, looks good.

A few nits around naming (to keep consistency), but I think we have a correctness issue with the missing matrix.target

Also wondering if we should add comments for the other workflows as well (Even if it in "sanity_test.yml" it just says run every time") so we are reminded to consider it in future.

[langleyd]

Nice suggestions @michaelkaye , thanks for the review!

[michaelkaye]

This looks good to me.

[ouchadam]

out of interest, what's the reasoning for needing more than the head ref? group: ${{ github.head_ref }}

[michaelkaye]

out of interest, what's the reasoning for needing more than the head ref? group: ${{ github.head_ref }}

Groups cross workflows, so the per-workflow name is required to avoid concurrency blocking across workflows ; the instances where we use the SHA hash is to ensure multiple runs on the same workflow can happen; the instances where the matrix target is also included is when we want both sides of the target to run.

(never used this before, but that was my understanding when i reviewed)

[ouchadam]

thanks for the explanation!