added env gin_mode, port, caching

Author: rvxt21

05-example-web-application/api-golang/Dockerfile

@@ -4,7 +4,9 @@ WORKDIR /app
 
 COPY go.mod go.sum ./
 
-RUN go mod download
+RUN --mount=type=cache,target=/go/pkg/mod \
+    --mount=type=cache,target=/root/.cache/go-build \
+    go mod download
 
 COPY . .
 
@@ -15,6 +17,10 @@ RUN go build \
 
 FROM scratch
 
+ENV GIN_MODE release
+
 COPY --from=build /app/api-golang api-golang
 
+EXPOSE 8080 
+
 CMD ["/api-golang"]