Gitea Actions support (#682)

This reworks the container to be usable with the Gitea act-runner and connect using TLS.

The directory structure is prepared so that a config.yml can be echoed into the container for authentication.

Co-authored-by: Pysen X <pysen@svartavillan.se>
Co-authored-by: Lunny Xiao <lunny@noreply.gitea.com>
Co-authored-by: techknowlogick <techknowlogick@noreply.gitea.com>
Reviewed-on: https://gitea.com/gitea/tea/pulls/682
Reviewed-by: Lunny Xiao <lunny@noreply.gitea.com>
Reviewed-by: techknowlogick <techknowlogick@noreply.gitea.com>
Co-authored-by: pysen <pysen@noreply.gitea.com>
Co-committed-by: pysen <pysen@noreply.gitea.com>

docs/example-workflows.md

@@ -0,0 +1,35 @@
+# Gitea actions workflows
+
+## Merge Pull request on approval
+
+``` Yaml
+---
+name: Pull request
+on:
+  pull_request_review:
+    types: [submitted, dismissed]
+jobs:
+  approved:
+    name: Approved
+    if: gitea.event.review.type == 'pull_request_review_approved'
+    container:
+      image: docker.io/pysen/tea:latest
+    runs-on: ubuntu-latest
+    steps:
+    - name: Configure Tea
+      env:
+        # This is a tea config.yml with (service) account token
+        TEA_CREDENTIALS: ${{ secrets.TEA_CREDENTIALS }}
+      run: |
+        echo "$TEA_CREDENTIALS" > $HOME/.config/tea/config.yml
+    - name: Rebase then fast-forward merge Git
+      run: |
+        tea pr merge --repo ${{ gitea.event.repository.full_name }} --style rebase ${{ gitea.event.pull_request.number }}
+  dismissed:
+    name: Dismissed
+    if: gitea.event.review.type == 'pull_request_review_rejected'
+    runs-on: ubuntu-latest
+    steps:
+    - run: |
+        tea pr reject --repo ${{ gitea.event.repository.full_name }} ${{ gitea.event.pull_request.number }} "Dismissed"
+```