Add ability to use release bot creds (#654)

Author: blink1073

.evergreen/github_app/backport-pr.sh

@@ -17,7 +17,7 @@ done
 
 # Bootstrap the app.
 source utils.sh
-bootstrap
+bootstrap drivers/release-bot
 
 # Run the app.
 

.evergreen/github_app/setup-secrets.sh

@@ -4,5 +4,6 @@ set -eu
 SCRIPT_DIR=$(dirname ${BASH_SOURCE[0]})
 . $SCRIPT_DIR/../handle-paths.sh
 pushd $SCRIPT_DIR > /dev/null
-. $SCRIPT_DIR/../secrets_handling/setup-secrets.sh drivers/comment-bot
+VAULT=${1:-drivers/comment-bot}
+. $SCRIPT_DIR/../secrets_handling/setup-secrets.sh $VAULT
 popd > /dev/null

.evergreen/github_app/utils.sh

@@ -7,7 +7,7 @@ function bootstrap() {
     pushd $SCRIPT_DIR > /dev/null
 
     # Bootstrap the secrets.
-    . ./setup-secrets.sh
+    . ./setup-secrets.sh ${1:-}
 
     # Install node and activate it.
     bash ../install-node.sh

.evergreen/tests/test-github-app.sh

@@ -10,6 +10,10 @@ pushd $DRIVERS_TOOLS/.evergreen/github_app
 . utils.sh
 bootstrap
 bash get-access-token.sh drivers-evergreen-tools mongodb-labs > /dev/null
+
+bootstrap drivers/release-bot
+bash get-access-token.sh mongo-arrow mongodb-labs > /dev/null
+
 popd
 
 make -C ${DRIVERS_TOOLS} test