Merge pull request #43 from mozilla/update-gha

Updating gha to keep branch name, instead of swap to 'stg'

Author: bsieber-mozilla

.github/workflows/build-image.yaml

@@ -22,10 +22,8 @@ jobs:
           echo $version_pattern;
           if [[ ${GITHUB_REF} =~ $version_pattern ]]; then
             echo "::set-output name=tag::${GITHUB_REF##*/}"
-          elif [ ${GITHUB_REF##*/} = "main" ]; then
-            echo "::set-output name=tag::stg-$CI_COMMIT_SHORT_SHA"
           else
-            echo "::set-output name=tag::$CI_COMMIT_SHORT_SHA"
+            echo "::set-output name=tag::${GITHUB_REF##*/}-$CI_COMMIT_SHORT_SHA"
           fi
         env:
           version_pattern: "tags\\/v[0-9]+\\.[0-9]+\\.[0-9]+"