Do not fail the build on teardown failures

Author: nkammah

.buildkite/build_pr_pipeline.yml

@@ -1,17 +1,17 @@
 steps:
   - key: "build-pr-setup"
     label: "setup"
-    command: .buildkite/scripts/build_pr_setup.sh
+    command: ".buildkite/scripts/build_pr_setup.sh"
   - key: "build-pr"
     label: ":hammer: Build docs PR"
-    command: .buildkite/scripts/build_pr.sh
+    command: ".buildkite/scripts/build_pr.sh"
     depends_on:
       - step: build-pr-setup
         allow_failure: true
     agents:
       provider: "gcp"
       image: family/docs-ubuntu-2204
-  - command: .buildkite/scripts/build_pr_teardown.sh
+  - command: ".buildkite/scripts/build_pr_teardown.sh || true"
     label: "teardown"
     depends_on:
       - step: "build-pr"