set arm version to match what we use on our arm switches

what we currently build gives core dumps

.github/workflows/main.yml

@@ -24,6 +24,7 @@ jobs:
         # build and publish in parallel: linux/amd64, linux/arm64, linux/arm
         goos: ["linux"]
         goarch: ["amd64", "arm", "arm64"]
+        goarm: "7"
     steps:
       - name: Check out the tag reference into the Go module directory
         uses: actions/checkout@v3