add first_run directive and script

Makefile

@@ -3,7 +3,7 @@ wifi: *.go */*.go go.*
 	go build -o $@ -ldflags "-s -w" -tags osusergo,netgo
 	file $@
 
-module.tar.gz: wifi
+module.tar.gz: wifi first_run.sh
 	# the bundled module
 	rm -f $@
 	tar czf $@ $^

first_run.sh

@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+
+if [[ -n "$VIAM_TEST_FAIL_RUN_FIRST" ]]; then
+    exit 1
+fi
+
+echo "first_run script ran successfully"
+
+exit 0

meta.json

@@ -15,5 +15,6 @@
     "arch" : ["linux/amd64", "linux/arm64", "darwin/arm64"],
     "darwin_deps": ["go"]
   },
-  "entrypoint": "wifi"
+  "entrypoint": "wifi",
+  "first_run": "first_run.sh"
 }