feature(ci): protobuf compatibility check (pt 2)

.github/workflows/protobuf.yml

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+name: Protobuf Compatibility
+
+on:
+  pull_request:
+    paths:
+        - "proto/**"
+        - "lib/vector-core/proto/**"
+  merge_group:
+    types: [checks_requested]
+
+concurrency:
+    # `github.event.number` exists for pull requests, otherwise fall back to SHA for merge queue
+    group: ${{ github.workflow }}-${{ github.event.number || github.event.merge_group.head_sha }}
+    cancel-in-progress: true
+
+jobs:
+  validate-protos:
+    runs-on: ubuntu-latest
+    steps:
+      # Run `git checkout`
+      - uses: actions/checkout@v3
+      # Install the `buf` CLI
+      - uses: bufbuild/buf-setup-action@v1.26.1
+      # Perform breaking change detection against the `master` branch
+      - uses: bufbuild/buf-breaking-action@v1.1.3
+        with:
+          against: "https://github.com/vectordotdev/vector.git#branch=dougsmith/buf"

buf.work.yaml

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+version: v1
+directories:
+  - proto 
+  - lib/vector-core/proto

lib/vector-core/proto/buf.yaml

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+version: v1
+breaking:
+  use:
+    - FILE
+lint:
+  use:
+    - DEFAULT

proto/buf.yaml

@@ -0,0 +1,7 @@
+version: v1
+breaking:
+  use:
+    - FILE
+lint:
+  use:
+    - DEFAULT