Make more use of environment variables.

Author: johnbillion

.github/workflows/reusable-cleanup-pull-requests.yml

@@ -29,20 +29,18 @@ jobs:
     steps:
       - name: Find fixed ticket numbers
         id: trac-tickets
+        env:
+          COMMIT_MSG_RAW: ${{ github.event.head_commit.message }}
         run: |
-          COMMIT_MESSAGE=$(cat <<'EOF' | sed -n '/^Fixes #/,/\./p'
-          ${{ github.event.head_commit.message }}
-          EOF
-          )
+          COMMIT_MESSAGE=$(echo "$COMMIT_MSG_RAW" | sed -n '/^Fixes #/,/\./p')
           echo "fixed_list=$(echo \"$COMMIT_MESSAGE\" | sed -n 's/.*Fixes #\([0-9]\+\).*/\1/p' | tr '\n' ' ')" >> $GITHUB_OUTPUT
 
       - name: Get the SVN revision
         id: git-svn-id
+        env:
+          COMMIT_MSG_RAW: ${{ github.event.head_commit.message }}
         run: |
-          COMMIT_MESSAGE=$(cat <<'EOF' | sed -n '$p'
-          ${{ github.event.head_commit.message }}
-          EOF
-          )
+          COMMIT_MESSAGE=$(echo "$COMMIT_MSG_RAW" | sed -n '$p')
           echo "svn_revision_number=$(echo \"$COMMIT_MESSAGE\" | sed -n 's/.*git-svn-id: https:\/\/develop.svn.wordpress.org\/[^@]*@\([0-9]*\) .*/\1/p')" >> $GITHUB_OUTPUT
 
       - name: Find pull requests