Add hook to verify goreleaser is using appropriate go verison

Author: simonswine

.goreleaser.yaml

@@ -1,7 +1,8 @@
 project_name: phlare
-# before:
-#   hooks:
-#     - make go/mod lint generate go/test
+before:
+  hooks:
+    # This hook ensures that goreleaser uses the correct go version for a Phlare release
+    - sh -euc "go version | grep "go version go1.19.4 " || { echo "Unexpected go version"; exit 1; }"
 builds:
   - env:
       - CGO_ENABLED=0