Add Dockerfile

Dockerfile

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+# syntax=docker/dockerfile:1.6
+
+ARG GO_VERSION=1.25
+
+############################
+# Build stage
+############################
+FROM harbor.maximumdirect.net/proxy-dockerhub/golang:${GO_VERSION}-bookworm AS build
+
+WORKDIR /src
+
+# Install baseline packages
+RUN apt-get update && apt-get install -y --no-install-recommends \
+      ca-certificates tzdata git build-essential \
+    && rm -rf /var/lib/apt/lists/*
+
+# Cache dependencies first
+COPY go.mod go.sum ./
+RUN --mount=type=cache,target=/go/pkg/mod \
+    go mod download
+
+# Copy the rest of the source
+COPY . .
+
+# Ensure go.sum is complete after dropping the replace
+RUN --mount=type=cache,target=/go/pkg/mod \
+    --mount=type=cache,target=/root/.cache/go-build
+
+# Default to a static build (no CGO)
+# If errors, can build with: --build-arg CGO_ENABLED=1
+ARG CGO_ENABLED=0
+ARG TARGETOS=linux
+ARG TARGETARCH=amd64
+ENV CGO_ENABLED=${CGO_ENABLED} \
+    GOOS=${TARGETOS} \
+    GOARCH=${TARGETARCH}
+
+# Run tests before building the final binary
+RUN --mount=type=cache,target=/go/pkg/mod \
+    --mount=type=cache,target=/root/.cache/go-build \
+    go test ./...
+
+# Build the cmd entrypoint
+RUN --mount=type=cache,target=/root/.cache/go-build \
+    go build \
+      -trimpath \
+      -ldflags="-s -w" \
+      -o /out/weatherapi \
+      ./cmd/weatherapi
+
+
+############################
+# Runtime stage
+############################
+FROM harbor.maximumdirect.net/proxy-dockerhub/debian:bookworm-slim AS runtime
+
+# Install runtime necessities
+RUN apt-get update && apt-get install -y --no-install-recommends \
+      ca-certificates tzdata curl \
+    && rm -rf /var/lib/apt/lists/*
+
+# Define /weatherapi as the working directory
+WORKDIR /weatherapi
+
+# Create an unprivileged user
+RUN useradd \
+      --uid 10001 \
+      --no-create-home \
+      --shell /usr/sbin/nologin \
+      weatherapi
+
+# Copy the binary
+COPY --chown=weatherapi:weatherapi --from=build /out/weatherapi /weatherapi/weatherapi
+
+USER weatherapi
+
+# The application expects config.yml in the same directory as the binary
+ENTRYPOINT ["/weatherapi/weatherapi"]