feat(dev): Add recipe for exposing webhook server

Starts an ngrok tunnel to expose port 8080 to the Internet.

.gitignore

@@ -20,3 +20,4 @@ Cargo.lock
 # git-next runtime files
 git-next-server.toml
 .git-next.toml
+.envrc

justfile

@@ -6,3 +6,12 @@ validate-dev-branch:
   git rebase -i origin/main -x 'cargo build'
   git rebase -i origin/main -x 'cargo test'
   git rebase -i origin/main -x 'cargo clippy -- -D warnings -W clippy::nursery -W clippy::unwrap_used -W clippy::expect_used'
+
+start-ngrok:
+  #!/usr/bin/env bash
+  # Uses NGROK_DOMAIN env var if available
+  if test -z ${NGROK_DOMAIN} ; then
+    ngrok http 8080
+  else
+    ngrok http --domain=${NGROK_DOMAIN} 8080
+  fi