Add Dockerfile and GH workflow

.github/dependabot.yaml

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+version: 2
+updates:
+  - package-ecosystem: gomod
+    directory: /
+    schedule:
+      interval: weekly

.github/workflows/workflow.yaml

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+name: Linux Docker build
+on:
+  push:
+  release:
+    types: [published]
+jobs:
+  build:
+    env:
+      REGISTRY: ghcr.io
+      IMAGENAME: ${{ github.event.repository.name }}
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+      name: Check out code
+    - name: Install Go
+      uses: actions/setup-go@v1
+      with:
+        go-version: 1.21.x
+    - name: Checkout code
+      uses: actions/checkout@v2
+    - name: Docker build
+      uses: mr-smithers-excellent/docker-build-push@v6
+      id: build
+      with:
+        image: ${{ env.IMAGENAME }}
+        registry: ${{ env.REGISTRY }}
+        username: ${{ github.repository_owner }}
+        password: ${{ secrets.GITHUB_TOKEN }}

Dockerfile

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+FROM golang:1.21-alpine as builder
+
+# Move to working directory /build
+WORKDIR /build
+
+# Copy and download dependency using go mod
+COPY go.mod .
+COPY go.sum .
+RUN go mod download
+
+# Copy the code into the container
+COPY . .
+
+# Build the application
+RUN go build -o main cmd/server/main.go
+
+# Start a new, final image to reduce size.
+FROM alpine as final
+
+# Copy the binaries and entrypoint from the builder image.
+COPY --from=builder /build/main /bin/
+
+ENTRYPOINT [ "/bin/main" ]