ci: add semver check (#106)

Adds a check_semver CI job using n0-computer/cargo-semver-checks-action,
matching the setup used across the iroh ecosystem.

Author: Arqu

.github/workflows/ci.yml

@@ -170,3 +170,33 @@ jobs:
         run: |
           rm -f Cargo.lock
           cargo +nightly check -Z minimal-versions -p irpc -p irpc-derive --all-features --lib --bins
+
+  check_semver:
+    runs-on: ubuntu-latest
+    env:
+      RUSTC_WRAPPER: "sccache"
+      SCCACHE_GHA_ENABLED: "on"
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+      - name: Install sccache
+        uses: mozilla-actions/sccache-action@v0.0.9
+
+      - name: Setup Environment (PR)
+        if: ${{ github.event_name == 'pull_request' }}
+        shell: bash
+        run: |
+          echo "HEAD_COMMIT_SHA=$(git rev-parse origin/${{ github.base_ref }})" >> ${GITHUB_ENV}
+      - name: Setup Environment (Push)
+        if: ${{ github.event_name == 'push' || github.event_name == 'merge_group' }}
+        shell: bash
+        run: |
+          echo "HEAD_COMMIT_SHA=$(git rev-parse origin/main)" >> ${GITHUB_ENV}
+      - name: Check semver
+        # uses: obi1kenobi/cargo-semver-checks-action@v2
+        uses: n0-computer/cargo-semver-checks-action@feat-baseline
+        with:
+          package: irpc, irpc-iroh
+          baseline-rev: ${{ env.HEAD_COMMIT_SHA }}
+          use-cache: false