fix: add step to determine runners (#1791)

* fix: add step to determine runners

This allows internal forks to run on self-hosted runners, defaulting to
the regular GH hosted runners labels.

* fix: add quotes to output

* fix: capitalize fromJSON

* fix: add job dependency

Author: diogomatsubara

.github/workflows/ci.yml

@@ -35,13 +35,31 @@ env:
   CARGO_SEMVER_CHECKS_BASELINE_VERSION: 1.0.0
 
 jobs:
+  determine-runner:
+    runs-on: ubuntu-latest
+    outputs:
+      runner: ${{ steps.set-runner.outputs.runner }}
+    steps:
+      - name: Clone this repository
+        uses: actions/checkout@v4
+
+      - name: Determine which runner to use
+        id: set-runner
+        run: |
+          if [[ -f ci/runners.json ]]; then
+            echo "runner=$(cat ci/runners.json)" >> $GITHUB_OUTPUT
+          else
+            echo "runner=['ubuntu-latest', 'windows-latest', 'macos-latest']" >> $GITHUB_OUTPUT
+          fi
+
   check:
+    needs: determine-runner
     name: Lints and doc tests on ${{ matrix.os }}
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, windows-latest, macos-latest]
+        os: ${{ fromJSON(needs.determine-runner.outputs.runner) }}
 
     steps:
       - name: Clone this repository
@@ -117,12 +135,13 @@ jobs:
         run: cargo +stable semver-checks --verbose --default-features --package zenoh --release-type ${{ env.CARGO_SEMVER_CHECKS_RELEASE_TYPE }} --baseline-version ${{ env.CARGO_SEMVER_CHECKS_BASELINE_VERSION }}
 
   test:
+    needs: determine-runner
     name: Unit tests on ${{ matrix.os }}
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, windows-latest, macos-latest]
+        os: ${{ fromJSON(needs.determine-runner.outputs.runner) }}
 
     steps:
       - name: Clone this repository