DodoApp: Use one network per external customer

Change-Id: I09864ad24a223b451c5877ad08bbc8960c80d41c
diff --git a/apps/app-runner/Dockerfile.golang.1.20.0 b/apps/app-runner/Dockerfile.golang.1.20.0
new file mode 100644
index 0000000..16f484f
--- /dev/null
+++ b/apps/app-runner/Dockerfile.golang.1.20.0
@@ -0,0 +1,5 @@
+FROM golang:1.20.0-alpine3.17
+
+ARG TARGETARCH
+
+COPY app-runner_${TARGETARCH} /usr/bin/app-runner