opendtu-logger/Dockerfile

# Use buildx for multi-architecture support
FROM --platform=${BUILDPLATFORM} golang:1.22 AS builder

WORKDIR /app

# Copy go.mod and go.sum files to download dependencies
COPY go.mod go.sum ./
RUN go mod download

# Copy the source code into the container
COPY . .

# Build the application for the specified target architecture
# https://www.docker.com/blog/faster-multi-platform-builds-dockerfile-cross-compilation-guide/
# Declare TARGETOS and TARGETARCH in the local scope so they can be used in the build stage.
ARG TARGETOS TARGETARCH
RUN CGO_ENABLED=0 GOOS=${TARGETOS} GOARCH=${TARGETARCH} go build -o opendtu-logger .

# Create a minimal runtime image
FROM --platform=${TARGETPLATFORM} scratch

WORKDIR /app

# Copy the executable from the builder stage
COPY --from=builder /app/opendtu-logger /app/opendtu-logger
COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/

# Run the application
CMD ["./opendtu-logger"]