[PATCH v5 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.

Change in v5 from v4:
- cleanup on dependencies installation.

Change in v4 from v3:
- Use build matrix
- All dependencies are install by scripts
- stop repeating environment variables
- build failure's artifacts will be uploaded

*** BLURB HERE ***

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, 309 insertions(+), 567 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 v4:
 1:  2219bf3db9 =  1:  2219bf3db9 ci/lib: if CI type is unknown, show the environment variables
 2:  2818799a4b =  2:  2818799a4b ci/lib: allow running in GitHub Actions
 3:  b88586c2c5 =  3:  b88586c2c5 ci/lib: set TERM environment variable if not exist
 4:  1df60e677c =  4:  1df60e677c ci: fix the `jobname` of the `GETTEXT_POISON` job
 5:  4f80724641 !  5:  ac7e247bb3 ci: explicit install all required packages
    @@ Commit message
     
         In a later patch, we will support GitHub Action.
     
    -    Explicitly install all of our build dependencies.
    -    Since GitHub Action VM hasn't install our build dependencies, yet.
    +    Explicitly install all of our build dependencies on Linux.
    +    Since GitHub Action's Linux VM hasn't installed our build dependencies.
         And there're no harm to reinstall them (in Travis)
     
         Signed-off-by: Đoàn Trần Công Danh <congdanhqx@gmail.com>
    @@ ci/install-dependencies.sh
      P4WHENCE=http://filehost.perforce.com/perforce/r$LINUX_P4_VERSION
      LFSWHENCE=https://github.com/github/git-lfs/releases/download/v$LINUX_GIT_LFS_VERSION
     +UBUNTU_COMMON_PKGS="make libssl-dev libcurl4-openssl-dev libexpat-dev
    -+ perl-modules liberror-perl tcl tk gettext zlib1g-dev apache2
    -+ libauthen-sasl-perl libemail-valid-perl libio-socket-ssl-perl
    -+ libnet-smtp-ssl-perl"
    ++ tcl tk gettext zlib1g-dev perl-modules liberror-perl libauthen-sasl-perl
    ++ libemail-valid-perl libio-socket-ssl-perl libnet-smtp-ssl-perl"
      
      case "$jobname" in
      linux-clang|linux-gcc)
    @@ ci/install-dependencies.sh
      	case "$jobname" in
      	linux-gcc)
      		sudo apt-get -q -y install gcc-8
    -@@ ci/install-dependencies.sh: StaticAnalysis)
    +@@ ci/install-dependencies.sh: osx-clang|osx-gcc)
    + StaticAnalysis)
    + 	sudo apt-get -q update
    + 	sudo apt-get -q -y install coccinelle libcurl4-openssl-dev libssl-dev \
    +-		libexpat-dev gettext
    ++		libexpat-dev gettext make
      	;;
      Documentation)
      	sudo apt-get -q update
     -	sudo apt-get -q -y install asciidoc xmlto docbook-xsl-ns
    -+	sudo apt-get -q -y install asciidoc xmlto docbook-xsl-ns \
    -+		libcurl4-openssl-dev
    ++	sudo apt-get -q -y install asciidoc xmlto docbook-xsl-ns make
      
      	test -n "$ALREADY_HAVE_ASCIIDOCTOR" ||
      	gem install --version 1.5.8 asciidoctor
      	;;
    -+GETTEXT_POISON)
    ++linux-gcc-4.8|GETTEXT_POISON)
     +	sudo apt-get -q update
     +	sudo apt-get -q -y install $UBUNTU_COMMON_PKGS
     +	;;
 6:  795ec656c6 <  -:  ---------- ci: run gem with sudo to install asciidoctor
 -:  ---------- >  6:  2fb9f2e2f2 ci: run gem with sudo to install asciidoctor
 7:  ec0aa20119 =  7:  40fe4f7e2c ci: configure GitHub Actions for CI/PR
 8:  46f2b6bce6 =  8:  09735fb1de README: add a build badge for the GitHub Actions runs
 9:  92f2623dc7 =  9:  575b3afd3c ci: retire the Azure Pipelines definition
10:  f688fa50d3 = 10:  ce00385987 tests: when run in Bash, annotate test failures with file name/line number
11:  715d1f732f = 11:  3caeb0b7f4 ci: add a problem matcher for GitHub Actions
12:  0908d5ab9b = 12:  8de46ee1c6 ci: let GitHub Actions upload failed tests' directories