Fix versioning to always be increasing. (#359)

This mirrors the fix in cashapp/misk#3036 which
corrects a subtle defect in the versioning algorithm. The version
numbers could end up going backwards due to the timezone of the commit
timestamp. The UTC normalization in this PR fixes it.

.github/workflows/Build.yml

@@ -84,8 +84,11 @@ jobs:
 
       - name: Assign a version
         run: |
-          # set a version name like "2023.05.26.091805-c1fcb3a"
-          echo "VERSION_NAME=$(git log -n1 --pretty='format:%cd' --date=format:'%Y.%m.%d.%H%M%S')-$(git rev-parse --short=7 HEAD)" >> gradle.properties
+          # Set a version name like "2023.05.26.091805-c1fcb3a".
+          # Note the use of %ct which gets the timestamp in UTC, in seconds since UNIX epoch to
+          # avoid time zone differences leading to non-linear versioning.
+          VERSION="$(TZ=UTC0 git show --quiet --date='format-local:%Y.%m.%d.%H%M%S' --format='%cd')-$(git rev-parse --short=7 HEAD)"
+          echo "VERSION_NAME=$VERSION" >> gradle.properties
           cat gradle.properties
 
       - name: Build Misk Web