Dockerfile Build Improvements

Dockerfile

@@ -1,9 +1,25 @@
+FROM golang:1.18 as builder
+
+# Go into the app dir
+WORKDIR /app
+
+# Copy all of the source to /app
+COPY . ./
+
+# Download dependencies
+RUN go mod download
+
+# Build
+RUN CGO_ENABLED=0 go build -a -installsuffix cgo -o freepad .
+
 FROM alpine
 
 LABEL version="1.4.0"
 
-# Copy the distribution files
-COPY ./dist /app
+# Copy the files from the builder to the new image
+COPY --from=builder /app/freepad /app/freepad
+COPY --from=builder /app/templates /app/templates
+COPY --from=builder /app/static /app/static
 
 # Make /app the work directory
 WORKDIR /app