Format .proto files with clang-format 19, add check to CI

.clang-format

@@ -286,4 +286,8 @@ WhitespaceSensitiveMacros:
   - NS_SWIFT_NAME
   - PP_STRINGIZE
   - STRINGIZE
+---
+Language: Proto
+BasedOnStyle: Google
+ColumnLimit: 0
 ...

.github/workflows/main.yml

@@ -119,6 +119,7 @@ jobs:
           - 'src'
           - 'tests'
           - 'utils'
+          - 'docs'
     steps:
       - uses: actions/checkout@v4
       - name: run clang-format
@@ -126,7 +127,7 @@ jobs:
         with:
           clang-format-version: "19"
           check-path: ${{ matrix.path }}
-          exclude-regex: '(libs\/gsl\/)|(tmpl)|(cpu_features)|^.*\.(cu|proto)$'
+          exclude-regex: '(libs\/gsl\/)|(tmpl)|(cpu_features)|^.*\.(cu)$'
 
   clang-tidy:
     runs-on: macos-latest

docs/CHANGELOG.md

@@ -19,6 +19,7 @@ All notable changes to GNSS-SDR will be documented in this file.
 - Added a CI job to detect lines longer than 512 characters (avoid this
   [lintian tag](https://lintian.debian.org/tags/very-long-line-length-in-source-file.html)
   warning).
+- Added formatting of `.proto` files with clang-format. Added check in CI job.
 
 ## [GNSS-SDR v0.0.20](https://github.com/gnss-sdr/gnss-sdr/releases/tag/v0.0.20) - 2025-04-01