Add Docker build + Gitea Actions CI (self-host at reformedwitness.net)

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

.dockerignore

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+.git
+Dockerfile
+.dockerignore
+README.md

.gitea/workflows/deploy.yml

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+name: build-and-publish
+on:
+  push:
+    branches: [master, main]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Log in to the Gitea registry
+        run: echo "${{ secrets.REGISTRY_TOKEN }}" | docker login git.thebennett.net -u "${{ secrets.REGISTRY_USER }}" --password-stdin
+      - name: Build + push
+        run: |
+          docker build -t git.thebennett.net/reformedwitness/rwn-website:latest -t git.thebennett.net/reformedwitness/rwn-website:${{ github.sha }} .
+          docker push git.thebennett.net/reformedwitness/rwn-website:latest
+          docker push git.thebennett.net/reformedwitness/rwn-website:${{ github.sha }}

Dockerfile

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+# syntax=docker/dockerfile:1
+FROM nginx:1.27-alpine
+COPY . /usr/share/nginx/html/
+RUN rm -f /usr/share/nginx/html/README.md /usr/share/nginx/html/Dockerfile /usr/share/nginx/html/.dockerignore
+EXPOSE 80