First attempt

.gitea/workflows/on-push.yaml

@@ -0,0 +1,20 @@
+name: on-push
+on: [push]
+
+jobs:
+  infra/misc/docker:
+    runs-on: linux
+    container: docker:latest
+    steps:
+      - name: Clone repository
+        uses: actions/checkout@v3
+      - name: Login
+        run: echo ${{ secrets.INFRA_ACCESS_TOKEN }} | docker login -u ${{ gitea.actor }} --password-stdin code.helloryan.se
+      - name: Build
+        run: docker buildx build -t code.helloryan.se/infra/misc/docker:${{ gitea.sha }} docker
+      - name: Test
+        run: docker run --rm code.helloryan.se/infra/misc/docker:${{ gitea.sha }} g++ --version
+      - name: Tag
+        run: docker tag code.helloryan.se/infra/misc/docker:${{ gitea.sha }} code.helloryan.se/infra/misc/docker:latest
+      - name: Push
+        run: docker push code.helloryan.se/infra/misc/docker:latest

docker/Dockerfile

@@ -0,0 +1 @@
+FROM docker:latest