Fix syntax error when appending env var to GITHUB_ENV

Author: sgilmore10

.github/workflows/package.yml

@@ -37,8 +37,8 @@ jobs:
           git fetch --tags --force origin
       - name: Extract crossbow job id
         run: |
-          CROSSBOW_JOB_ID=$(git for-each-ref refs/tags/$GIT_TAG_NAME --format='%(contents:subject)')
-          echo $CROSSBOW_JOB_ID >> $GITHUB_ENV
+          crossbow_job_id=$(git for-each-ref refs/tags/$GIT_TAG_NAME --format='%(contents:subject)')
+          echo "CROSSBOW_JOB_ID=$crossbow_job_id" >> $GITHUB_ENV
         env:
           GIT_TAG_NAME: ${{github.ref_name}}
       - name: Setup Archery