mac ci: clean up branch/repo before build (#1512)
mac ci: clean up branch/repo before build (#1512)


lizan/envoy,envoyproxy/envoy-wasm,envoyproxy/envoy,istio/envoy,lyft/envoy,envoyproxy/envoy,amalgam8/envoy,lyft/envoy,lyft/envoy,istio/envoy,istio/envoy,rlazarus/envoy,jrajahalme/envoy,lyft/envoy,amalgam8/envoy,rlazarus/envoy,dnoe/envoy,tdmackey/envoy,tdmackey/envoy,eklitzke/envoy,envoyproxy/envoy,envoyproxy/envoy,sebrandon1/envoy,istio/envoy,envoyproxy/envoy,tdmackey/envoy,lizan/envoy,envoyproxy/envoy,craffert0/envoy,sebrandon1/envoy,istio/envoy,envoyproxy/envoy-wasm,eklitzke/envoy,envoyproxy/envoy,jrajahalme/envoy,lizan/envoy,jrajahalme/envoy,eklitzke/envoy,fengli79/envoy,rlazarus/envoy,eklitzke/envoy,dnoe/envoy,envoyproxy/envoy-wasm,lizan/envoy,tdmackey/envoy,rlazarus/envoy,lyft/envoy,envoyproxy/envoy,eklitzke/envoy,jrajahalme/envoy,dnoe/envoy,jrajahalme/envoy,envoyproxy/envoy,envoyproxy/envoy,dnoe/envoy,envoyproxy/envoy-wasm,fengli79/envoy,lyft/envoy,istio/envoy,dnoe/envoy,craffert0/envoy,amalgam8/envoy,envoyproxy/envoy-wasm,amalgam8/envoy,fengli79/envoy,lizan/envoy,eklitzke/envoy,envoyproxy/envoy,istio/envoy,sebrandon1/envoy,sebrandon1/envoy,jrajahalme/envoy,craffert0/envoy,craffert0/envoy,lizan/envoy,fengli79/envoy,envoyproxy/envoy,sebrandon1/envoy,envoyproxy/envoy-wasm,envoyproxy/envoy-wasm