add ci/cd workflow

.forgejo/workflows/image.yaml

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+# SPDX-FileCopyrightText: 2025 Ncam Gnrvngu <info@ncamgnrvngu.eu>
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+on:
+  push:
+    branches:
+      - master
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: docker/setup-buildx-action@v3
+      - uses: docker/login-action@v3
+        with:
+          username: ncamgnrvngu
+          password: ${{ secrets.DOCKER_TOKEN }}
+          registry: git.ncamgnrvngu.eu
+      - uses: docker/build-push-action@v6
+        with:
+          push: true
+          tags: git.ncamgnrvngu.eu/ncamgnrvngu/website:latest

Dockerfile

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+# SPDX-FileCopyrightText: 2025 Ncam Gnrvngu <info@ncamgnrvngu.eu>
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+FROM ghcr.io/getzola/zola:v0.20.0 AS zola
+
+WORKDIR /project
+COPY . /project
+RUN ["zola", "build"]
+
+FROM nginx:latest
+WORKDIR /usr/share/nginx/html
+COPY --from=zola /project/public .
+