Migrate to gitea-actions (#8)

Reviewed-on: #8

.gitea/workflows/lint.yaml

@@ -0,0 +1,28 @@
+name: Linting
+
+on:
+  pull_request:
+
+jobs:
+  lint:
+    runs-on: cth-ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - uses: addnab/docker-run-action@v3
+      with:
+        image: docker.atomaka.com/mdformat:latest
+        options: --volumes-from=${{ env.JOB_CONTAINER_NAME }}
+        run: |
+          cd ${{ github.workspace }}
+          mdformat --check _posts/
+  build:
+    runs-on: cth-ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: 3.1.2
+    - run: |
+        gem install bundler
+        bundle install
+        bundle exec jekyll build