Refactor Github Action per b/485167538

Author: benknutson-google

.github/workflows/dist.yml

@@ -47,11 +47,11 @@ jobs:
         id: event-args
         run: |
           set -x
-          REF="${{ github.event.ref }}"
+          REF="${GITHUB_EVENT_REF}"
           TAG=$(echo $REF| sed 's/refs\/tags\///')
           DIST_TAG="dist-$TAG"
-          git config user.email "${{ github.event.head_commit.author.email }}"
-          git config user.name "${{ github.event.head_commit.author.name }}"
+          git config user.email "${GITHUB_EVENT_HEAD_COMMIT_AUTHOR_EMAIL}"
+          git config user.name "${GITHUB_EVENT_HEAD_COMMIT_AUTHOR_NAME}"
           git checkout -b tmp-$DIST_TAG
           # remove workflow etc, otherwise we'll need workflow override permissions
           rm -rf .github
@@ -71,3 +71,7 @@ jobs:
           git tag -a $DIST_TAG -m "dist for $TAG" -f
           git push origin $DIST_TAG -f
           echo "done pushing to git"
+        env:
+          GITHUB_EVENT_REF: ${{ github.event.ref }}
+          GITHUB_EVENT_HEAD_COMMIT_AUTHOR_EMAIL: ${{ github.event.head_commit.author.email }}
+          GITHUB_EVENT_HEAD_COMMIT_AUTHOR_NAME: ${{ github.event.head_commit.author.name }}