add quotes around value sent to trigger METplus workflow and remove u…

…nnecessary step

.github/workflows/build_docker_and_trigger_metplus.yml

@@ -80,16 +80,16 @@ jobs:
             echo "ERROR: Could not get METplus branch"
             exit 1
           fi
+
+          # if branch doesn't exist in remote, do not trigger METplus workflow
           branch_exists=$(git -C $GITHUB_WORKSPACE/METplus ls-remote origin ${metplus_branch})
           if [ -z "${branch_exists}" ]; then
             echo "METplus branch ${metplus_branch} does not exist yet"
             metplus_branch=none
           fi
+
           echo "metplus_branch=${metplus_branch}" >> $GITHUB_OUTPUT
-      - if: ( steps.get_metplus_branch.outputs.metplus_branch  != 'none' )
-        run: |
-          metplus_branch=${{ steps.get_metplus_branch.outputs.metplus_branch }}
-          echo "Triggering workflow dispatch of ${metplus_branch}"
+
       - if: ( steps.get_metplus_branch.outputs.metplus_branch  != 'none' )
         uses: actions/github-script@v7
         with:
@@ -99,7 +99,7 @@ jobs:
               owner: 'dtcenter',
               repo: 'METplus',
               workflow_id: 'testing.yml',
-              ref: ${{ steps.get_metplus_branch.outputs.metplus_branch }},
+              ref: '${{ steps.get_metplus_branch.outputs.metplus_branch }}',
               inputs: {
                 repository: '${{ github.repository }}',
                 ref: '${{ github.ref }}',