auto enable auto merge on PRs (#973)

* auto enable auto merge on PRs

* lint

.github/workflows/auto_merge.yml

@@ -0,0 +1,57 @@
+name: auto_merge
+
+on:
+    pull_request:
+        branches: [main]
+        types:
+            - opened
+            - reopened
+
+jobs:
+    auto_merge:
+        runs-on: ubuntu-latest
+        steps:
+            - name: Print contexts
+              env:
+                  GITHUB_CONTEXT: ${{ toJson(github) }}
+                  ENV_CONTEXT: ${{ toJson(env) }}
+                  VARS_CONTEXT: ${{ toJson(vars) }}
+                  JOB_CONTEXT: ${{ toJson(job) }}
+                  STEPS_CONTEXT: ${{ toJson(steps) }}
+                  RUNNER_CONTEXT: ${{ toJson(runner) }}
+                  SECRETS_CONTEXT: ${{ toJson(secrets) }}
+                  STRATEGY_CONTEXT: ${{ toJson(strategy) }}
+                  MATRIX_CONTEXT: ${{ toJson(matrix) }}
+                  NEEDS_CONTEXT: ${{ toJson(needs) }}
+                  INPUTS_CONTEXT: ${{ toJson(inputs) }}
+              run: |
+                  echo "******************************"
+                  echo "github:" "$GITHUB_CONTEXT"
+                  echo "******************************"
+                  echo "env:" "$ENV_CONTEXT"
+                  echo "******************************"
+                  echo "vars:" "$VARS_CONTEXT"
+                  echo "******************************"
+                  echo "job:" "$JOB_CONTEXT"
+                  echo "******************************"
+                  echo "steps:" "$STEPS_CONTEXT"
+                  echo "******************************"
+                  echo "runner:" "$RUNNER_CONTEXT"
+                  echo "******************************"
+                  echo "secrets:" "$SECRETS_CONTEXT"
+                  echo "******************************"
+                  echo "strategy:" "$STRATEGY_CONTEXT"
+                  echo "******************************"
+                  echo "matrix:" "$MATRIX_CONTEXT"
+                  echo "******************************"
+                  echo "needs:" "$NEEDS_CONTEXT"
+                  echo "******************************"
+                  echo "inputs:" "$INPUTS_CONTEXT"
+                  echo "******************************"
+
+            - name: Enable auto-merge on PR
+              env:
+                  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+              run: |
+                  echo "Enabling auto-merge on PR"
+                  gh pr merge ${{ github.event.number }} --auto --squash