ci: migrate GitLab CI to Gitea Actions (kaniko -> Gitea registry)

.gitea/workflows/deploy.yml

@@ -0,0 +1,61 @@
+name: Build + push image
+on:
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+env:
+  REGISTRY: gitea.saas.vnc.biz
+  IMAGE: gitea.saas.vnc.biz/vnciac/prosody-muc-rest
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    env:
+      REGISTRY_USER: ${{ secrets.REGISTRY_USER }}
+      REGISTRY_TOKEN: ${{ secrets.REGISTRY_TOKEN }}
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Compute image tag
+        run: |
+          SHORT_SHA=$(echo "${GITHUB_SHA}" | cut -c1-8)
+          echo "SHORT_SHA=${SHORT_SHA}" >> $GITHUB_ENV
+
+      # kaniko builds straight from a Dockerfile and pushes to the registry, running
+      # as a static binary inside the job container — the runner has no Docker daemon.
+      - name: Fetch kaniko (daemon-less image builder)
+        run: |
+          set -euo pipefail
+          curl -fsSL -o /tmp/crane.tgz \
+            https://github.com/google/go-containerregistry/releases/download/v0.21.9/go-containerregistry_Linux_x86_64.tar.gz
+          tar -xzf /tmp/crane.tgz -C /usr/local/bin crane
+          mkdir -p /tmp/kaniko-root
+          crane export gcr.io/kaniko-project/executor:debug /tmp/kaniko-fs.tar
+          tar -xf /tmp/kaniko-fs.tar -C /tmp/kaniko-root
+          cp /tmp/kaniko-root/kaniko/executor /usr/local/bin/kaniko-executor
+          chmod +x /usr/local/bin/kaniko-executor
+          /usr/local/bin/kaniko-executor version
+
+      # kaniko's push auth reads $DOCKER_CONFIG/config.json (go-containerregistry
+      # authn.DefaultKeychain). Write to both locations and export DOCKER_CONFIG so
+      # auth is picked up regardless of how $HOME resolves.
+      - name: Configure registry auth for push
+        run: |
+          AUTH=$(printf '%s:%s' "${REGISTRY_USER}" "${REGISTRY_TOKEN}" | base64 -w0)
+          CFG=$(printf '{"auths":{"%s":{"auth":"%s"}}}' "${REGISTRY}" "${AUTH}")
+          mkdir -p /kaniko/.docker "$HOME/.docker"
+          printf '%s' "$CFG" > /kaniko/.docker/config.json
+          printf '%s' "$CFG" > "$HOME/.docker/config.json"
+          echo "DOCKER_CONFIG=/kaniko/.docker" >> "$GITHUB_ENV"
+
+      # The MUC REST Dockerfile lives at the repo root; its ADD paths (app/,
+      # config/, package.json) are relative to the root.
+      - name: Build + push image
+        run: |
+          /usr/local/bin/kaniko-executor \
+            --context "dir://${GITHUB_WORKSPACE}" \
+            --dockerfile Dockerfile \
+            --skip-tls-verify-registry="${REGISTRY}" \
+            --destination "${IMAGE}:sha-${SHORT_SHA}" \
+            --destination "${IMAGE}:latest"