feat: build a debug-shell and distroless container

cmd/fake_sh/fake_sh.go

@@ -0,0 +1,19 @@
+package main
+
+import (
+	"fmt"
+	"os"
+)
+
+var imageTag string
+
+func main() {
+	if imageTag == "" {
+		os.Exit(1)
+	}
+
+	fmt.Fprintln(os.Stderr, "Headplane containers do not contain a shell by default.")
+	fmt.Fprintln(os.Stderr, "If you need a non-production container with a shell and root access use:")
+	fmt.Fprintf(os.Stderr, "\n%s-shell\n\n", imageTag)
+	os.Exit(127)
+}