restructure repo, separate sample app from docker configs

06-building-container-images/api-golang/Dockerfile.1

@@ -0,0 +1,11 @@
+# Pin specific version for stability
+# Use alpine for reduced image size
+FROM golang:1.19-alpine
+
+WORKDIR /app 
+
+COPY . .
+
+RUN go mod download
+
+CMD ["go", "run", "./main.go"]