Fix action and add force merge option (#1)

* debug

* add envs manually

* fix spelling

* fix output

* exit on wrong event type

* pull_request name

* add merge option

* fix merge condition

* move pre-condition

* fix

* single quotes

* done testing

* untested merge condition

* try fix bad substitution

* test approve

* echo merge info test

* done testing

* update README

README.md

@@ -1 +1,27 @@
 Used together with [action-terraform](https://github.com/Pararius/action-terraform) for auto-approving (and merging) of pull request created by Dependabot
+
+Example usage:
+
+```yaml
+  terraform:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Terraform
+        uses: Pararius/action-terraform@0.0.29
+        with:
+          terraform_directory: ./terraform
+          terraform_do_apply: false
+          terraform_parallelism: 3
+
+  auto-approve:
+    runs-on: ubuntu-latest
+    needs: [terraform]
+    if: github.actor == 'dependabot[bot]'
+    steps:
+      - uses: Pararius/action-terraform-automerge@dev
+        with:
+          github-token: <github-token-here>
+          terraform-directory: 'terraform/'
+          merge: true
+```

action.yml

@@ -1,35 +1,59 @@
-name: Terraform Auto-Approve
-description: 'Auto-approve terrafrom changes that do not have state changes'
+name: Terraform auto-merge
+description: 'Auto-approve or Auto-merge terrafrom changes that do not have state changes'
 inputs:
   github-token:
     description: 'Github token of the bot used for the auto-approving'
     required: true
   terraform-directory:
-    description: 'Root directory for the terraform files'
+    description: 'Root directory for the terraform files e.g. terraform/'
     required: true
+  merge:
+    description: 'Enable auto-merging'
+    required: false
+    default: false
+  force-merge:
+    description: 'Enable auto-merging using admin access'
+    required: false
+    default: false
 runs:
   using: 'composite'
   steps:
+  - if: github.event_name != 'pull_request'
+    run: exit 1
+    shell: bash
+  # get changed files inside pr (limited to 100 per request, but dependabot PRs are small so who cares)
   - run: |
-      # todo. check that this is a pr and skip (or fail) other workflow events
-      pr_number=$(echo "$GIHUB_REF" | cut -d '/' -f3)
-      gh pr -R "${GIHUB_REPOSITORY}" view "${pr_number}" --json files --jq '.files.[].path' \
-        | grep -qo "^${TERRAFORM_DIR}" && echo "skip=false"|| echo "skip=false" >> $GITHUB_OUTPUT
+      PR_NUMBER=$(echo "$GITHUB_REF" | cut -d '/' -f3)
+      TERRAFORM_DIR=$(echo "$TERRAFORM_DIR" | sed 's@\(\./\|/\)@@g')
+      gh pr -R "${GITHUB_REPOSITORY}" view "${PR_NUMBER}" --json files --jq '.files.[].path' \
+        | grep -qv "^${TERRAFORM_DIR}/" || echo "skip=false" >> $GITHUB_OUTPUT
     shell: bash
     id: check
     env:
       GITHUB_TOKEN: ${{ inputs.github-token }}
       TERRAFORM_DIR: ${{ inputs.terraform-directory }}
+  # download artifact created by pararius/action-terraform
   - uses: actions/download-artifact@v3
-    if: steps.check.outputs.skip == 'false' # don't fail
+    if: steps.check.outputs.skip == 'false'
     with:
       name: terraform
       path: summary
+  # output true if any state in inputs.terraform-directory changed
   - id: summary
-    if: steps.check.outputs.skip == 'false' # don't fail
+    if: steps.check.outputs.skip == 'false'
     shell: bash
     run: cat summary/terraform/*.summary | grep 'true' || echo "has_changes=false" >> $GITHUB_OUTPUT
+  # approve based on summary step ouptput
   - uses: hmarr/auto-approve-action@v3
-    if: steps.bheck.outputs.skip == 'false' && steps.summary.outputs.has_changes == 'false'
+    if: steps.summary.outputs.has_changes == 'false'
     with:
       github-token: ${{ inputs.github-token }}
+  # merge based on summary step output
+  - if: (inputs.merge || inputs.force-merge) && steps.summary.outputs.has_changes == 'false'
+    run: |
+      PR_NUMBER=$(echo "$GITHUB_REF" | cut -d '/' -f3)
+      gh pr -R "${GITHUB_REPOSITORY}" merge "${PR_NUMBER}" -s `[[ "$USE_ADMIN" == "true" ]] && echo '--admin'`
+    shell: bash
+    env:
+      USE_ADMIN: ${{ inputs.force-merge }}
+      GITHUB_TOKEN: ${{ inputs.github-token }}