chore: initialize Gitea v1.27.2 fork

Includes direct password setup links in registration emails.

Assisted-by: Codex:GPT-5

.github/actions/docker-dryrun/action.yml

@@ -0,0 +1,29 @@
+name: docker-dryrun
+description: Composite action that performs the container build steps for a single platform.
+
+inputs:
+  platform:
+    description: "The target platform: linux/amd64, linux/arm64, linux/riscv64."
+    required: true
+
+runs:
+  using: composite
+  steps:
+    - uses: docker/setup-qemu-action@06116385d9baf250c9f4dcb4858b16962ea869c3 # v4.1.0
+    - uses: docker/setup-buildx-action@d7f5e7f509e45cec5c76c4d5afdd7de93d0b3df5 # v4.1.0
+    - name: Build regular image
+      uses: docker/build-push-action@f9f3042f7e2789586610d6e8b85c8f03e5195baf # v7.2.0
+      with:
+        context: .
+        platforms: ${{ inputs.platform }}
+        push: false
+        file: Dockerfile
+        cache-from: type=registry,ref=ghcr.io/go-gitea/gitea:buildcache-rootful
+    - name: Build rootless image
+      uses: docker/build-push-action@f9f3042f7e2789586610d6e8b85c8f03e5195baf # v7.2.0
+      with:
+        context: .
+        platforms: ${{ inputs.platform }}
+        push: false
+        file: Dockerfile.rootless
+        cache-from: type=registry,ref=ghcr.io/go-gitea/gitea:buildcache-rootless