Added static Docker image

.gitea/workflows/static_docker_build.yaml

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+name: Build Docker images for static folder
+
+on:
+  workflow_dispatch:
+  push:
+    branches: [ "main" ]
+    tags: [ "*" ]
+
+defaults:
+  run:
+    working-directory: static
+
+jobs:
+  acls:
+    runs-on: ubuntu-latest
+
+    steps:
+      -
+        name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: git.prettysunflower.moe/prettysunflower/kakigoori-static
+      -
+        name: Login to Gitea Container Hub
+        uses: docker/login-action@v3
+        with:
+          registry: git.prettysunflower.moe
+          username: ${{ vars.HUB_USERNAME }}
+          password: ${{ secrets.HUB_TOKEN }}
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      -
+        name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: "{{defaultContext}}:static"
+          push: ${{ gitea.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          platforms: linux/amd64,linux/arm64

static/Caddyfile

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+:8002 {
+	root * /srv/
+	file_server
+}

static/Dockerfile

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+FROM caddy:latest
+
+COPY Caddyfile /etc/caddy/Caddyfile
+COPY . /srv/