[PATCH 04/10] CI: make "$jobname" explicit, remove fallback

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

Remove the $jobname fallback last adjusted in b011fabd6e0 (ci/lib.sh:
encapsulate Travis-specific things, 2019-01-27).

This makes all of our CI jobs have an explicit $jobname, and removes
the special-case of the Windows jobs implicitly setting one (that they
don't currently use).

This is a follow-up to my 25715419bf4 (CI: don't run "make test" twice
in one job, 2021-11-23), since then all the jobs except the Windows
jobs have had an explicit $jobname.

In the case of the Windows jobs we were using a jobname of windows-gcc
for both, due to picking "gcc" as a default fallback for "$CC" in
ci/lib.sh.

Since we'll need this to run ci/lib.sh it makes sense to move the
check to the top of the file.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
---
 .github/workflows/main.yml |  7 +++++++
 ci/lib.sh                  | 12 +++++++-----
 2 files changed, 14 insertions(+), 5 deletions(-)

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index cd1f52692a5..8b7697df9fb 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -79,6 +79,8 @@ jobs:
 
   windows-build:
     name: win build
+    env:
+      jobname: windows-build
     needs: ci-config
     if: needs.ci-config.outputs.enabled == 'yes'
     runs-on: windows-latest
@@ -100,6 +102,8 @@ jobs:
         path: artifacts
   windows-test:
     name: win test
+    env:
+      jobname: windows-test
     runs-on: windows-latest
     needs: [windows-build]
     strategy:
@@ -134,6 +138,7 @@ jobs:
     needs: ci-config
     if: needs.ci-config.outputs.enabled == 'yes'
     env:
+      jobname: vs-build
       NO_PERL: 1
       GIT_CONFIG_PARAMETERS: "'user.name=CI' 'user.email=ci@git'"
     runs-on: windows-latest
@@ -183,6 +188,8 @@ jobs:
         path: artifacts
   vs-test:
     name: win+VS test
+    env:
+      jobname: vs-test
     runs-on: windows-latest
     needs: vs-build
     strategy:
diff --git a/ci/lib.sh b/ci/lib.sh
index fcb79c83087..969ba2ff0d0 100755
--- a/ci/lib.sh
+++ b/ci/lib.sh
@@ -8,6 +8,13 @@
 # are installed.
 set -e
 
+# Starting assertions
+if test -z "$jobname"
+then
+	echo "error: must set a CI jobname in the environment" >&2
+	exit 1
+fi
+
 if test true != "$GITHUB_ACTIONS"
 then
 	begin_group () { :; }
@@ -119,11 +126,6 @@ else
 	exit 1
 fi
 
-if test -z "$jobname"
-then
-	jobname="$CI_OS_NAME-$CC"
-fi
-
 export DEVELOPER=1
 export DEFAULT_TEST_TARGET=prove
 export GIT_TEST_CLONE_2GB=true
-- 
2.37.1.996.g651fc6e809f