feat: dump github action context

Author: zoncrd

.github/workflows/tag.yaml

@@ -9,9 +9,13 @@ jobs:
     steps:
     - name: checkout source code
       uses: actions/checkout@v1
+    - name: Dump GitHub context
+      env:
+        GITHUB_CONTEXT: ${{ toJSON(github) }}
+      run: echo "$GITHUB_CONTEXT"
     - name: Get Branch
       run: |
         raw=$(git branch -r --contains ${{ github.ref }})
         branch=${raw/origin\/}
         echo ::set-env name=BRANCH::$branch
-    - run: echo ${{ env.BRANCH }}
+    - run: echo ${{ env.BRANCH }}