start stack from container (#40)

resolves #36

Co-authored-by: johba <johba@harb.eth>
Reviewed-on: https://codeberg.org/johba/harb/pulls/40

scripts/dev.sh

@@ -18,6 +18,11 @@ start_stack() {
     rm -f "$PID_FILE"
   fi
 
+  # Show branch if set
+  if [[ -n "${GIT_BRANCH:-}" ]]; then
+    echo "Branch: $GIT_BRANCH"
+  fi
+
   echo "Building kraiken-lib..."
   ./scripts/build-kraiken-lib.sh
 
@@ -71,7 +76,16 @@ check_health() {
 }
 
 usage() {
-  echo "Usage: $0 {start|stop|health}"
+  cat <<EOF
+Usage: $0 {start|stop|health}
+
+Environment Variables:
+  GIT_BRANCH    Branch to checkout in containers
+
+Examples:
+  GIT_BRANCH=fix/something ./scripts/dev.sh start
+  ./scripts/dev.sh health
+EOF
   exit 1
 }