[PATCH v4 00/12] ci: replace our Azure Pipeline by GitHub Actions

Our Azure Pipeline has served us well over the course of the past year or so, steadily catching issues before the respective patches hit the next branch.

There is a GitHub-native CI system now, though, called "GitHub Actions" [https://github.com/features/actions] which is essentially on par with Azure Pipelines as far as our needs are concerned, and it brings a couple of advantages:

 * It is substantially easier to set up than Azure Pipelines: all you need
   is to add the YAML-based build definition, push to your fork on GitHub,
   and that's it.
 * The syntax is a bit easier to read than Azure Pipelines'.
 * We get more concurrent jobs (Azure Pipelines is limited to 10 concurrent
   jobs).

With this change, users also no longer need to open a PR at https://github.com/git/git or at https://github.com/gitgitgadget/git just to get the benefit of a CI build.

Sample run on top of dd/ci-musl-libc with dd/test-with-busybox merged: https://github.com/sgn/git/actions/runs/73179413

Sample run when this series applied into git-for-windows https://github.com/git-for-windows/git/runs/568625109

Change from v3:
- Use build matrix
- All dependencies are install by scripts
- stop repeating environment variables
- build failure's artifacts will be uploaded

Johannes Schindelin (9):
  ci/lib: if CI type is unknown, show the environment variables
  ci/lib: allow running in GitHub Actions
  ci: fix the `jobname` of the `GETTEXT_POISON` job
  ci: run gem with sudo to install asciidoctor
  README: add a build badge for the GitHub Actions runs
  ci: retire the Azure Pipelines definition
  tests: when run in Bash, annotate test failures with file name/line
    number
  ci: add a problem matcher for GitHub Actions
  ci: let GitHub Actions upload failed tests' directories

Đoàn Trần Công Danh (3):
  ci/lib: set TERM environment variable if not exist
  ci: explicit install all required packages
  ci: configure GitHub Actions for CI/PR

 .github/workflows/main.yml  | 230 +++++++++++++++
 .travis.yml                 |   2 +-
 README.md                   |   2 +-
 azure-pipelines.yml         | 558 ------------------------------------
 ci/git-problem-matcher.json |  16 ++
 ci/install-dependencies.sh  |  16 +-
 ci/lib.sh                   |  31 +-
 ci/print-test-failures.sh   |   7 +
 t/test-lib.sh               |  14 +-
 9 files changed, 310 insertions(+), 566 deletions(-)
 create mode 100644 .github/workflows/main.yml
 delete mode 100644 azure-pipelines.yml
 create mode 100644 ci/git-problem-matcher.json

Range-diff against v3:
 1:  3f9f1c6335 =  1:  2219bf3db9 ci/lib: if CI type is unknown, show the environment variables
 2:  7a4f646bc1 =  2:  2818799a4b ci/lib: allow running in GitHub Actions
 3:  9a03c0844c =  3:  b88586c2c5 ci/lib: set TERM environment variable if not exist
 4:  7308199e24 <  -:  ---------- ci: configure GitHub Actions for CI/PR
 -:  ---------- >  4:  1df60e677c ci: fix the `jobname` of the `GETTEXT_POISON` job
 -:  ---------- >  5:  4f80724641 ci: explicit install all required packages
 -:  ---------- >  6:  795ec656c6 ci: run gem with sudo to install asciidoctor
 -:  ---------- >  7:  ec0aa20119 ci: configure GitHub Actions for CI/PR
 5:  365ba5e831 =  8:  46f2b6bce6 README: add a build badge for the GitHub Actions runs
 6:  53094612d3 !  9:  92f2623dc7 ci: retire the Azure Pipelines definition
    @@ Commit message
         Pipelines would be redundant, and a waste of energy.
     
         Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
    -    [Danh: fix apply conflicts]
         Signed-off-by: Đoàn Trần Công Danh <congdanhqx@gmail.com>
     
      ## README.md ##
    @@ azure-pipelines.yml (deleted)
     -      PathtoPublish: t/failed-test-artifacts
     -      ArtifactName: failed-test-artifacts
     -
    --- job: linux_musl
    --  displayName: linux-musl
    --  condition: succeeded()
    --  pool:
    --    vmImage: ubuntu-latest
    --  steps:
    --  - bash: |
    --       test "$GITFILESHAREPWD" = '$(gitfileshare.pwd)' || ci/mount-fileshare.sh //gitfileshare.file.core.windows.net/test-cache gitfileshare "$GITFILESHAREPWD" "$HOME/test-cache" || exit 1
    --
    --       res=0
    --       sudo AGENT_OS="$AGENT_OS" BUILD_BUILDNUMBER="$BUILD_BUILDNUMBER" BUILD_REPOSITORY_URI="$BUILD_REPOSITORY_URI" BUILD_SOURCEBRANCH="$BUILD_SOURCEBRANCH" BUILD_SOURCEVERSION="$BUILD_SOURCEVERSION" SYSTEM_PHASENAME="$SYSTEM_PHASENAME" SYSTEM_TASKDEFINITIONSURI="$SYSTEM_TASKDEFINITIONSURI" SYSTEM_TEAMPROJECT="$SYSTEM_TEAMPROJECT" CC=$CC MAKEFLAGS="$MAKEFLAGS" jobname=linux-musl bash -lxc ci/run-docker.sh || res=1
    --
    --       sudo chmod a+r t/out/TEST-*.xml
    --       test ! -d t/failed-test-artifacts || sudo chmod a+r t/failed-test-artifacts
    --
    --       test "$GITFILESHAREPWD" = '$(gitfileshare.pwd)' || sudo umount "$HOME/test-cache" || res=1
    --       exit $res
    --    displayName: 'jobname=linux-musl ci/run-docker.sh'
    --    env:
    --      GITFILESHAREPWD: $(gitfileshare.pwd)
    --  - task: PublishTestResults@2
    --    displayName: 'Publish Test Results **/TEST-*.xml'
    --    inputs:
    --      mergeTestResults: true
    --      testRunTitle: 'musl'
    --      platform: Linux
    --      publishRunAttachments: false
    --    condition: succeededOrFailed()
    --  - task: PublishBuildArtifacts@1
    --    displayName: 'Publish trash directories of failed tests'
    --    condition: failed()
    --    inputs:
    --      PathtoPublish: t/failed-test-artifacts
    --      ArtifactName: failed-test-artifacts
    --
     -- job: static_analysis
     -  displayName: StaticAnalysis
     -  condition: succeeded()
 -:  ---------- > 10:  f688fa50d3 tests: when run in Bash, annotate test failures with file name/line number
 -:  ---------- > 11:  715d1f732f ci: add a problem matcher for GitHub Actions
 -:  ---------- > 12:  0908d5ab9b ci: let GitHub Actions upload failed tests' directories