changelog_to_tag action - support other than "master" for the main br…

…anch name, as well (linux-system-roles#291)

.github/workflows/changelog_to_tag.yml

@@ -31,15 +31,20 @@ jobs:
                   echo "$line"
               fi
           done > ./.tagmsg.txt
-          _tagname=$( grep -m 1 "[0-9]*\.[0-9]*\.[0-9]*" CHANGELOG.md | sed -e "s/^.*\[\([0-9]*\.[0-9]*\.[0-9]*\)\].*/\1/" )
+          _tagname=$( grep -m 1 "[0-9]*\.[0-9]*\.[0-9]*" CHANGELOG.md | \
+                      sed -e "s/^.*\[\([0-9]*\.[0-9]*\.[0-9]*\)\].*/\1/" )
           git fetch --all --tags
           for t in $( git tag -l ); do
               if [[ $t == "$_tagname" ]]; then
                   echo INFO: tag $t already exists
                   exit 1
               fi
           done
+          # Get the main branch name, "master" or "main".
+          _branch=$( git branch -r | grep -o 'origin/HEAD -> origin/.*$' | \
+                     awk -F'/' '{print $3}' )
           echo ::set-output name=tagname::"$_tagname"
+          echo ::set-output name=branch::"$_branch"
       - name: Create tag
         uses: mathieudutour/[email protected]
         with:
@@ -59,3 +64,4 @@ jobs:
         uses: robertdebock/[email protected]
         with:
           galaxy_api_key: ${{ secrets.galaxy_api_key }}
+          git_branch: ${{ steps.tag.outputs.branch }}