RUST-2136 Add manual release trigger script (#1301)

Author: abr-egn

.evergreen/release-manual-trigger.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+
+# This should only be used if the normal evergreen automation triggered by the
+# tag push has failed.  This will manually trigger the same evergreen workflow
+# that the tag push would have.
+
+if [[ -z "$TAG" ]]; then
+  echo >&2 "\$TAG must be set to the git tag of the release"
+  exit 1
+fi
+if [[ "$CONFIRM" != "YES" ]]; then
+  echo >&2 "THIS ACTION IS IRREVOCABLE.  Set \$CONFIRM to YES to validate that you really want to release a new version of the driver."
+  exit 1
+fi
+
+evergreen patch --path .evergreen/releases.yml -t publish-release -v all -u -p mongo-rust-driver-current --browse --param triggered_by_git_tag=${TAG}