Initial implementation

.github/actions/install-flatc/action.yml

@@ -0,0 +1,46 @@
+name: Install flatc
+description: Download and install a flatc binary for CI
+
+inputs:
+  version:
+    description: FlatBuffers release version to install
+    required: true
+  sha256:
+    description: SHA-256 of the expected flatc archive
+    required: true
+
+runs:
+  using: composite
+  steps:
+    - name: Download flatc
+      shell: bash
+      run: |
+        set -euo pipefail
+
+        mkdir -p flatbuffers-bin
+        asset=""
+        candidates=(
+          "Linux.flatc.binary.g++-13.zip"
+          "Linux.flatc.binary.clang++-18.zip"
+        )
+
+        for candidate in "${candidates[@]}"; do
+          if curl --retry 5 --retry-delay 2 --retry-connrefused --connect-timeout 10 --max-time 120 -fsSL -o flatbuffers-bin/flatc.zip "https://github.com/google/flatbuffers/releases/download/v${{ inputs.version }}/${candidate}"; then
+            actual_sha256="$(sha256sum flatbuffers-bin/flatc.zip | awk '{print $1}')"
+            if [[ "${actual_sha256}" == "${{ inputs.sha256 }}" ]]; then
+              asset="${candidate}"
+              break
+            fi
+            rm -f flatbuffers-bin/flatc.zip
+          fi
+        done
+
+        if [[ -z "${asset}" ]]; then
+          echo "::error::failed to download flatc v${{ inputs.version }}; attempted assets: ${candidates[*]}"
+          exit 1
+        fi
+
+        unzip -q flatbuffers-bin/flatc.zip -d flatbuffers-bin
+        chmod +x flatbuffers-bin/flatc
+        sudo install flatbuffers-bin/flatc /usr/local/bin/flatc
+        rm -rf flatbuffers-bin

.github/workflows/ci.yml

@@ -4,15 +4,19 @@ on:
   push:
   pull_request:
 
+env:
+  FLATBUFFERS_VERSION: 25.12.19
+  FLATBUFFERS_SHA256: 9f87066dc5dfa7fe02090b55bab5f3e55df03e32c9b0cdf229004ade7d091039
+
 jobs:
   fmt-lint:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - name: Install flatbuffers compiler
-        run: |
-          sudo apt-get update
-          sudo apt-get install -y flatbuffers-compiler
+      - uses: ./.github/actions/install-flatc
+        with:
+          version: ${{ env.FLATBUFFERS_VERSION }}
+          sha256: ${{ env.FLATBUFFERS_SHA256 }}
       - uses: dtolnay/rust-toolchain@stable
         with:
           components: rustfmt, clippy
@@ -26,10 +30,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - name: Install flatbuffers compiler
-        run: |
-          sudo apt-get update
-          sudo apt-get install -y flatbuffers-compiler
+      - uses: ./.github/actions/install-flatc
+        with:
+          version: ${{ env.FLATBUFFERS_VERSION }}
+          sha256: ${{ env.FLATBUFFERS_SHA256 }}
       - uses: dtolnay/rust-toolchain@stable
       - uses: Swatinem/rust-cache@v2
       - name: Run unit and integration tests
@@ -39,11 +43,11 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - name: Install flatbuffers compiler
-        run: |
-          sudo apt-get update
-          sudo apt-get install -y flatbuffers-compiler
+      - uses: ./.github/actions/install-flatc
+        with:
+          version: ${{ env.FLATBUFFERS_VERSION }}
+          sha256: ${{ env.FLATBUFFERS_SHA256 }}
       - uses: dtolnay/rust-toolchain@stable
       - uses: Swatinem/rust-cache@v2
       - name: Run ignored PTY smoke test
-        run: cargo test -p mux-test-support pty_round_trips_input -- --ignored
+        run: cargo test -p embers-test-support pty_round_trips_input -- --ignored