ID:FCLD-228;DONE:7;HOURS:7; system file gen test in builder

Dockerfile

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+### SYSTEM GENERATED FILE, MAKE CHANGES AS NEEDED ###
+
+# Use a specific version as the base image for the builder stage
+FROM golang:1.21-alpine AS builder
+
+# Set /app as the working directory in the builder stage
+WORKDIR /app
+
+### UNCOMMENT AS NEEDED ###
+# Copy go.mod and go.sum files into the builder stage
+# This allows the dependencies to be installed before copying the rest of the application code
+COPY go.sum ./
+COPY go.mod ./
+
+### DEFAULT BOOTSTRAP BUILD CODE, RUN LOCALLY TO GENERATE go.mod ###
+# If go.mod exists and not empty, install the listed packages
+# If it doesn't exist or is empty, print a message and skip the installation
+RUN if [ -s go.mod ]; then \
+        go mod download; \
+    else \
+        echo "No go.mod found, continuing with default settings"; \
+        go mod init app; \
+    fi
+
+# Copy the rest of the application code into the builder stage
+COPY . /app
+
+# Build the application
+RUN go build -v -o app .
+
+# Start a new stage with a distroless image for smaller image size and improved security
+FROM gcr.io/distroless/static-debian11
+
+# Copy the /app directory from the builder stage into the current stage
+# This includes the application code and the installed packages
+COPY --from=builder /app /app
+
+# Set /app as the working directory in the current stage
+WORKDIR /app
+
+# Set the command to run when the container starts
+# This will start the application
+CMD [ "./app" ]

fc.toml

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+app = "golang-dockerfile-app-sample"
+region = "asia-south1"
+handler = ""
+
+[build]
+  dockerfile = "Dockerfile"
+  ignorefile = ".gitignore"
+  [build.args]
+    foo = "bar"
+
+[env]
+  FOO = "BAR"
+
+[http_service]
+  internal_port = 3000

go.mod

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+module golang-buildpack-app-sample
+
+go 1.21.5

main.go

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+package main
+
+import (
+	"fmt"
+	"net/http"
+)
+
+func handler(w http.ResponseWriter, r *http.Request) {
+	fmt.Fprintf(w, "Hello World!")
+}
+
+func main() {
+	// Register the handler function to handle requests to "/"
+	http.HandleFunc("/", handler)
+
+	// Start the HTTP server on port 3000
+	fmt.Println("Example app listening on port 3000!")
+	http.ListenAndServe(":3000", nil)
+}