re-introduce old nss im too tired for this

security/nss/automation/taskcluster/scripts/run_coverity.sh

@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+
+source $(dirname "$0")/tools.sh
+
+# Clone NSPR if needed.
+if [ ! -d "nspr" ]; then
+    hg_clone https://hg.mozilla.org/projects/nspr ./nspr default
+
+  if [[ -f nss/nspr.patch && "$ALLOW_NSPR_PATCH" == "1" ]]; then
+    pushd nspr
+    cat ../nss/nspr.patch | patch -p1
+    popd
+  fi
+fi
+
+# Build and run Coverity
+cd nss
+./mach static-analysis
+
+# Return the exit code of the Coverity Analysis
+exit $?