CI: rename the "Linux32" job to lower-case "linux32"

As a follow-up to the preceding commit's shortening of CI job names,
rename the only job that starts with an upper-case letter to be
consistent with the rest. It was added in 88dedd5e72 (Travis: also
test on 32-bit Linux, 2017-03-05).

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

.github/workflows/main.yml

@@ -266,7 +266,8 @@ jobs:
         vector:
         - jobname: linux-musl
           image: alpine
-        - jobname: Linux32
+        - jobname: linux32
+          os: ubuntu32
           image: daald/ubuntu32:xenial
         - jobname: pedantic
           image: fedora

ci/install-docker-dependencies.sh

@@ -4,7 +4,7 @@
 #
 
 case "$jobname" in
-Linux32)
+linux32)
 	linux32 --32bit i386 sh -c '
 		apt update >/dev/null &&
 		apt install -y build-essential libcurl4-openssl-dev \

ci/lib.sh

@@ -191,7 +191,7 @@ osx-clang|osx-gcc)
 	;;
 linux-gcc-default)
 	;;
-Linux32)
+linux32)
 	CC=gcc
 	;;
 linux-musl)

ci/run-docker-build.sh

@@ -15,7 +15,7 @@ then
 fi
 
 case "$jobname" in
-Linux32)
+linux32)
 	switch_cmd="linux32 --32bit i386"
 	;;
 linux-musl)

ci/run-docker.sh

@@ -6,7 +6,7 @@
 . ${0%/*}/lib.sh
 
 case "$jobname" in
-Linux32)
+linux32)
 	CI_CONTAINER="daald/ubuntu32:xenial"
 	;;
 linux-musl)