chore: initialize Gitea v1.27.2 fork

Includes direct password setup links in registration emails.

Assisted-by: Codex:GPT-5

.github/workflows/pull-docker-dryrun.yml

@@ -0,0 +1,47 @@
+name: docker-dryrun
+
+on:
+  pull_request:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  files-changed:
+    uses: ./.github/workflows/files-changed.yml
+
+  # QEMU-based build is slow (40-50 minutes), so run arm64 and riscv64 when dockerfile changes.
+  # Run amd64 when any docker-related files change, which is fast (4 minutes).
+  container-amd64:
+    if: needs.files-changed.outputs.docker == 'true'
+    needs: [files-changed]
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
+      - uses: ./.github/actions/docker-dryrun
+        with:
+          platform: linux/amd64
+
+  container-arm64:
+    if: needs.files-changed.outputs.dockerfile == 'true'
+    needs: [files-changed]
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
+      - uses: ./.github/actions/docker-dryrun
+        with:
+          platform: linux/arm64
+
+  container-riscv64:
+    if: needs.files-changed.outputs.dockerfile == 'true'
+    needs: [files-changed]
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
+      - uses: ./.github/actions/docker-dryrun
+        with:
+          platform: linux/riscv64