Run cargo-semver-checks in CI

.github/workflows/cargo-semver-check.yml

@@ -0,0 +1,29 @@
+on:
+  pull_request:
+    types: [opened, reopened, synchronize, labeled, unlabeled]
+  merge_group:
+
+name: Check semver breakage
+
+jobs:
+  cargo-semver-check:
+    runs-on: ubuntu-latest
+
+    # Skip if PR is labelled as breaking change
+    if: ${{ ! contains(github.event.pull_request.labels.*.name, 'breaking change') }}
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Semver check crates without "unstable" feature
+        uses: obi1kenobi/cargo-semver-checks-action@v2
+        with:
+          feature-group: default-features
+      - name: Semver check crates with "unstable" feature
+        uses: obi1kenobi/cargo-semver-checks-action@v2
+        with:
+          exclude: defmt, defmt-json-schema
+          features: unstable
+      - name: Semver check firmware crates
+        uses: obi1kenobi/cargo-semver-checks-action@v2
+        with:
+          manifest-path: firmware/

CHANGELOG.md

@@ -7,15 +7,17 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
-- [#xxx]: `CI`: Update mdbook to v0.4.40
+- [#852]: `CI`: Update mdbook to v0.4.40
 - [#847]: `decoder`: Fix log format width specifier not working as expected
 - [#845]: `decoder`: fix println!() records being printed with formatting
 - [#843]: `defmt`: Sort IDs of log msgs by severity to allow runtime filtering by severity
+- [#822]: `CI`: Run `cargo semver-checks` on every PR
 
-[#xxx]: https://github.com/knurling-rs/defmt/pull/xxx
+[#852]: https://github.com/knurling-rs/defmt/pull/852
 [#847]: https://github.com/knurling-rs/defmt/pull/847
 [#845]: https://github.com/knurling-rs/defmt/pull/845
 [#843]: https://github.com/knurling-rs/defmt/pull/843
+[#822]: https://github.com/knurling-rs/defmt/pull/822
 
 ## [v0.3.8] - 2024-05-17