fixup! release: create initial Windows installer build workflow

Probably in yet another patch to accommodate Meson (don't you love it
now?) the spaces in the `GIT-VERSION-FILE` are now gone. Where before,
its contents looked somewhat like this:

	GIT_VERSION = 2.48.1.vfs.0.0

they now look this this (note the removed spaces):

	GIT_VERSION=2.48.1.vfs.0.0

Well, so here is yet another other patch to accommodate Meson, so that
we can finally get a pre-release of v2.48.1.vfs.0.0 out.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

.github/workflows/build-git-installers.yml

@@ -46,7 +46,7 @@ jobs:
           # Verify tag follows rules in GIT-VERSION-GEN (i.e., matches the specified "DEF_VER" in
           # GIT-VERSION-FILE) and matches tag determined from trigger
           make GIT-VERSION-FILE
-          test "${{ steps.tag.outputs.version }}" == "$(sed -n 's/^GIT_VERSION = //p'< GIT-VERSION-FILE)" || die "GIT-VERSION-FILE tag does not match ${{ steps.tag.outputs.name }}"
+          test "${{ steps.tag.outputs.version }}" == "$(sed -n 's/^GIT_VERSION *= *//p'< GIT-VERSION-FILE)" || die "GIT-VERSION-FILE tag ($(cat GIT-VERSION-FILE)) does not match ${{ steps.tag.outputs.name }}"
   # End check prerequisites for the workflow
 
   # Build Windows installers (x86_64 & aarch64; installer & portable)