finish docker file for building prod

Dockerfile

@@ -1,7 +1,24 @@
-FROM alpine:latest
+FROM golang:latest as builder
+# Define build env
+ENV GOOS linux
+ENV CGO_ENABLED 0
+# Add a work directory
+WORKDIR /build
+# Cache and install dependencies
+COPY go.mod go.sum ./
+RUN go mod download
+# Copy app files
+COPY . .
+# Build app
+RUN go build -o app
 
-WORKDIR /app
+FROM alpine:latest as production
+# Add certificates
+RUN apk add --no-cache ca-certificates
+# Copy built binary from builder
+COPY --from=builder build/app .
+# Expose port
+EXPOSE 4000
+# Exec built binary
+CMD ./app
 
-COPY build/go-resolve /app/go-resolve
-
-ENTRYPOINT [ "/app/go-resolve" ]

build.sh

@@ -1,13 +1,13 @@
 #!/bin/bash
 
-echo "Cleaning up"
-rm -rf build/
-mkdir build/
-
-echo "Building executable"
-go build -o build/go-resolve
-
-if [[ "$1" == "--docker" ]]; then
+if [[ "$1" == "docker" ]]; then
     echo "Building docker image"
-    docker build -t ghcr.io/leonlatsch/go-resolve .
+    docker build -t ghcr.io/leonlatsch/go-resolve . --target production
+else
+    echo "Cleaning up"
+    rm -rf build/
+    mkdir build/
+
+    echo "Building executable"
+    go build -o build/go-resolve
 fi