Implement webhook branch filter (#7791)

* Fix validate() function to handle errors in embedded anon structs

* Implement webhook branch filter

See #2025, #3998.

vendor/github.com/gobwas/glob/bench.sh

@@ -0,0 +1,26 @@
+#! /bin/bash
+
+bench() {
+    filename="/tmp/$1-$2.bench"
+    if test -e "${filename}";
+    then
+        echo "Already exists ${filename}"
+    else
+        backup=`git rev-parse --abbrev-ref HEAD`
+        git checkout $1
+        echo -n "Creating ${filename}... "
+        go test ./... -run=NONE -bench=$2 > "${filename}" -benchmem
+        echo "OK"
+        git checkout ${backup}
+        sleep 5
+    fi
+}
+
+
+to=$1
+current=`git rev-parse --abbrev-ref HEAD`
+
+bench ${to} $2
+bench ${current} $2
+
+benchcmp $3 "/tmp/${to}-$2.bench" "/tmp/${current}-$2.bench"