[PATCH 1/2] CI: use shorter names that fit in UX tooltips

["Ævar Arnfjörð Bjarmason" <avarab@gmail.com>]

Change the names used for the GitHub CI workflows to be short enough
to (mostly) fit in the pop-up tool-tips that GitHub shows in the
commit view. I.e. when mouse-clicking on the passing or failing
check-mark next to the commit subject.

That description is truncated to 24 characters, with the 3 at the end
being placed by "...".

E.g. the full job name (visible at [1]):

    "regular (linux-gcc-default, gcc, ubuntu-latest)"

Will, when shown in the tool-tip be truncated to:

    "CI/PR / regular (linu..."

There's then a further limit in the expanded view where the job names
are observably truncated to 44 characters (including "..."). I.e.:

    "regular (linux-gcc-default, gcc, ubuntu-l..."

With this change we shorten both the job names, and change the
top-level "name" from "CI/PR" to "CI", since it will be used as a
prefix in the tooltips. We also remove redundant or superfluous
information from the name, e.g. "ubuntu-latest" isn't really needed
for "linux-leaks", it'll suffice to say linux. For discovering what
image runs that specifically we can consult main.yml itself.

The above "regular (linux-gcc-default, gcc, ubuntu-latest)" job name
then becomes a 1=1 match to the "$jobname" used in
"ci/run-build-and-tests.sh". A "( push" or " (pull_request" is then
added implicitly as before (from the top-level "on" parameter in
"main.yml"). In the tooltip we'll now show:

    "CI / linux-leaks (pu..."

We then have no truncation in the expanded view. See [2] for a
currently visible CI run using this commit, and [3] for the GitHub
workflow syntax involved being changed here.

We could avoid even more truncation with more compact names,
e.g. changing "linux" to "lin" or "lnx", but I didn't do that since
any additional shortening seemed counterproductive, i.e. "w32" is a
well-known way of referring to "Windows", but "lin" isn't). We could
also shorten e.g. "::build" and "::test" to "+bld" and "+tst", but
those seem similarly to be overly obtuse.

1. https://github.com/git/git/tree/master/
2. https://github.com/avar/git/tree/avar/ci-shorter-names
3. https://docs.github.com/en/actions/learn-github-actions/workflow-syntax-for-github-actions

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
---
 .github/workflows/main.yml | 13 ++++++++++++-
 README.md                  |  2 +-
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 6ed6a9e8076..8f4caa8f040 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -1,4 +1,4 @@
-name: CI/PR
+name: CI
 
 on: [push, pull_request]
 
@@ -7,6 +7,7 @@ env:
 
 jobs:
   ci-config:
+    name: config
     runs-on: ubuntu-latest
     outputs:
       enabled: ${{ steps.check-ref.outputs.enabled }}${{ steps.skip-if-redundant.outputs.enabled }}
@@ -77,6 +78,7 @@ jobs:
             }
 
   windows-build:
+    name: w32::build
     needs: ci-config
     if: needs.ci-config.outputs.enabled == 'yes'
     runs-on: windows-latest
@@ -97,6 +99,7 @@ jobs:
         name: windows-artifacts
         path: artifacts
   windows-test:
+    name: w32::test
     runs-on: windows-latest
     needs: [windows-build]
     strategy:
@@ -127,6 +130,7 @@ jobs:
         name: failed-tests-windows
         path: ${{env.FAILED_TEST_ARTIFACTS}}
   vs-build:
+    name: w32/VS::build
     needs: ci-config
     if: needs.ci-config.outputs.enabled == 'yes'
     env:
@@ -178,6 +182,7 @@ jobs:
         name: vs-artifacts
         path: artifacts
   vs-test:
+    name: w32/VS::test
     runs-on: windows-latest
     needs: vs-build
     strategy:
@@ -210,6 +215,7 @@ jobs:
         name: failed-tests-windows
         path: ${{env.FAILED_TEST_ARTIFACTS}}
   regular:
+    name: ${{matrix.vector.jobname}}
     needs: ci-config
     if: needs.ci-config.outputs.enabled == 'yes'
     strategy:
@@ -251,6 +257,7 @@ jobs:
         name: failed-tests-${{matrix.vector.jobname}}
         path: ${{env.FAILED_TEST_ARTIFACTS}}
   dockerized:
+    name: ${{matrix.vector.jobname}} (docker)
     needs: ci-config
     if: needs.ci-config.outputs.enabled == 'yes'
     strategy:
@@ -258,10 +265,13 @@ jobs:
       matrix:
         vector:
         - jobname: linux-musl
+          os: alpine
           image: alpine
         - jobname: Linux32
+          os: ubuntu32
           image: daald/ubuntu32:xenial
         - jobname: pedantic
+          os: fedora
           image: fedora
     env:
       jobname: ${{matrix.vector.jobname}}
@@ -310,6 +320,7 @@ jobs:
       run: ci/install-dependencies.sh
     - run: make sparse
   documentation:
+    name: documentation
     needs: ci-config
     if: needs.ci-config.outputs.enabled == 'yes'
     env:
diff --git a/README.md b/README.md
index eb8115e6b04..f6f43e78deb 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-[![Build status](https://github.com/git/git/workflows/CI/PR/badge.svg)](https://github.com/git/git/actions?query=branch%3Amaster+event%3Apush)
+[![Build status](https://github.com/git/git/workflows/CI/badge.svg)](https://github.com/git/git/actions?query=branch%3Amaster+event%3Apush)
 
 Git - fast, scalable, distributed revision control system
 =========================================================
-- 
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