Add CI

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

.gitea/Containerfile

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+FROM ghcr.io/catthehacker/ubuntu:act-latest
+
+RUN apt-get update && apt-get install -y hugo

.gitea/workflows/main.yaml

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+name: Build and Release Site
+
+on:
+  push:
+    branches:
+      - "**"
+
+jobs:
+  builder:
+    uses: karaolidis/workflows/.gitea/workflows/builder.yaml@main
+    with:
+      registry: git.karaolidis.com
+      username: ${{ github.repository_owner }}
+    secrets:
+      password: ${{ secrets.REGISTRY_PASSWORD }}
+
+  release:
+    runs-on: nix
+    needs: builder
+    container:
+      image: ${{ needs.builder.outputs.tag }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          submodules: recursive
+
+      - name: Build Site
+        run: |
+          cd themes/caldwell
+          npm install
+          cd ../..
+          ln -s ./themes/caldwell/node_modules node_modules
+          pwd
+          hugo --minify
+
+      - name: Package
+        run: |
+          tar -czf site.tar.gz -C public .
+
+      - name: Release
+        uses: https://github.com/akkuman/gitea-release-action@main
+        with:
+          name: "Release ${{ github.sha }}"
+          tag_name: "release-${{ github.sha }}"
+          files: site.tar.gz