add debugger (Delve)

Author: joonas-fi

Dockerfile

@@ -16,6 +16,7 @@ WORKDIR /workspace
 # and if we bind mount workspace from outside of container Git complains if container uid doesn't match that of files.
 
 RUN apt update && apt install -y zip \
+	&& go install github.com/go-delve/delve/cmd/[email protected] \
 	&& go install golang.org/x/tools/cmd/goimports@latest \
 	&& go install golang.org/x/tools/cmd/godoc@latest \
 	&& go install golang.org/x/tools/gopls@latest \