add prepare block for scheduling logic

.github/workflows/conan.yml

@@ -1,11 +1,33 @@
 name: Test conan packages
 
 on:
+  # Run weekdays at 11:15pm UTC, and specify below to only run if there's been new commits
+  schedule:
+    - cron: "15 11 * * 1-5" 
   workflow_dispatch:
 
 jobs:
+  prepare:
+    # if: github.repository_owner == 'viamrobotics'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Code
+        uses: actions/checkout@v4
+
+      - name: Get new commit count
+        id: new_commit_count
+        shell: bash
+        run: echo "commit_count=$(git log --oneline --since '24 hours ago' | wc -l)" >> $GITHUB_OUTPUT
+
+      - name: Cancelling scheduled build with no new commits
+        uses: andymckay/[email protected]
+        if: |
+          steps.new_commit_count.outputs.commit_count == '0' &&
+          github.event_name == 'schedule'
+
   build_macos:
     # if: github.repository_owner == 'viamrobotics'
+    needs: [prepare]
     runs-on: macos-latest
     strategy:
       fail-fast: false
@@ -38,6 +60,7 @@ jobs:
 
   build_linux_ubuntu_jammy:
     # if: github.repository_owner == 'viamrobotics'
+    needs: [prepare]
     runs-on:  ${{ matrix.runs_on }}
     container:
       image: ${{ matrix.image }}
@@ -95,6 +118,7 @@ jobs:
 
   build_linux_debian:
     # if: github.repository_owner == 'viamrobotics'
+    needs: [prepare]
     runs-on:  ${{ matrix.runs_on }}
     container:
       image: ${{ matrix.image }}