feat(github): add flipt tag driven protobuf generate action

.github/workflows/proto-upgrade.yml

@@ -0,0 +1,52 @@
+on:
+  workflow_dispatch:
+
+inputs:
+  tag:
+    required: true
+    description: Flipt release version tag to generate
+
+permissions:
+  contents: write
+  pull-requests: write
+
+name: proto-upgrade
+jobs:
+  proto-upgrade:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Set up Go
+        uses: actions/setup-go@v3
+        with:
+          go-version: 1.19
+
+      - name: Setup go-task/task
+        use: 'lagren/setup-task@v1'
+
+      - name: Clone Flipt into sub-directory
+        run: gh repo clone flipt-io/flipt
+
+      - name: Bootstrap Tools
+        run: |
+          pushd ./flipt
+          git checkout ${{ inputs.tag }}
+          task bootstrap
+          popd
+
+      - name: Buf Generate
+        run: buf generate
+
+      - name: Remove Flipt
+        run: rm -rf ./flipt/
+
+      - name: Prepare Branch
+        run: |
+          git checkout -b "generate/${{ inputs.tag }}"
+          git add .
+          git commit -m "feat: updates to protobuf definitions for flipt ${{ inputs.tag }}"
+          git push origin "generate/${{ inputs.tag }}"
+          gh pr create --fill
+

buf.gen.yaml

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+version: v1
+plugins:
+  - name: go
+    out: .
+    opt:
+      - paths=source_relative
+  - name: go-grpc
+    out: .
+    opt:
+      - paths=source_relative

buf.work.yaml

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+version: v1
+directories:
+  - flipt/rpc/flipt