feat: create docker image building

.dockerignore

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+# Files
+LICENSE
+README.md
+
+# Folders
+.git/
+.gitea/
+content/
+data/
+deployments/
+docker/
+scripts/

.gitea/workflows/docker.yaml

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+name: Docker Build and Push
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - 'main'
+    tags:
+      - '*'
+  release:
+    types: [ published ]
+
+env:
+  GITEA_CONTAINER_REG: gitea.nerthus.nl
+  DOCKER_IMAGE_NAME: orbits-server
+
+jobs:
+  docker_build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    strategy:
+      fail-fast: false
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Log in to Gitea container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.GITEA_CONTAINER_REG }}
+          username: ${{ gitea.repository_owner }}
+          password: ${{ secrets.GITEA_TOKEN }}
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+        with:
+          platforms: linux/amd64,linux/arm64
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Extract Docker metadata from environment
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: |
+            ${{ env.GITEA_CONTAINER_REG }}/daanselen/${{ env.DOCKER_IMAGE_NAME }}
+          tags: |
+            type=ref,event=branch
+            type=ref,event=tag
+            type=sha,format=short,prefix=
+
+      - name: Build and export Docker image
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: ./docker/Dockerfile
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          platforms: linux/amd64,linux/arm64

docker/Dockerfile

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+FROM docker.io/golang:1.26-trixie AS build
+
+RUN mkdir /app
+COPY . /app
+
+WORKDIR /app
+RUN go mod tidy \
+  && mkdir /app/bin \
+  && go build -o /app/bin/orbits cmd/server/main.go
+
+FROM docker.io/debian:trixie-slim AS runtime
+
+RUN mkdir -p /app /data/config /data/content
+COPY --from=build /app/bin/orbits /app/bin/orbits
+
+ENV CONTENT_DIR=/data/content \
+    DATA_DIR=/data/config
+
+CMD ["/app/bin/orbits"]