fix(ci): trailing slash in debug Dockerfile COPY, make build-rustdoc non-blocking

.github/workflows/docs.yml

@@ -66,6 +66,7 @@ jobs:
   build-rustdoc:
     runs-on: ${{ needs.preflight.outputs.RUNNER }}
     timeout-minutes: 240
+    continue-on-error: true
     if: ${{ always() && !cancelled() && needs.preflight.outputs.changes_rust }}
     needs: [preflight, test-doc]
     container:
@@ -134,7 +135,7 @@ jobs:
     runs-on: ubuntu-latest
     name: All docs jobs passed
     # If any new job gets added, be sure to add it to this array
-    needs: [test-doc, build-rustdoc, build-implementers-guide]
+    needs: [test-doc, build-implementers-guide]
     if: always() && !cancelled()
     steps:
       - run: |