ci: reduce low-signal Actions usage

.github/workflows/CI.yml

@@ -3,7 +3,8 @@ name: Linux
 on:
   push:
     branches:
-      - '**'
+      - master
+      - 'release-*'
     paths:
       - '**'
     tags:
@@ -15,6 +16,10 @@ on:
       - '**'
   workflow_dispatch:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
 permissions:
   contents: write
 
@@ -285,7 +290,6 @@ jobs:
         uses: actions/setup-python@v6
         with:
           python-version: '3.x'
-          cache: pip
       - name: "Install validator deps"
         run: |
           python -m pip install --upgrade pip

.github/workflows/CI_Windows.yml

@@ -15,6 +15,10 @@ on:
       - '**'
   workflow_dispatch:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
 jobs:
   test:
     runs-on: ${{ matrix.os }}

.github/workflows/CI_apptainer.yml

@@ -1,18 +1,8 @@
 name: Apptainer
 
 on:
-  push:
-    branches:
-      - 'master'
-    paths:
-      - '**'
-    tags:
-      - 'v*.*.*'
-  pull_request:
-    branches:
-      - 'master'
-    paths:
-      - '**'
+  schedule:
+    - cron: "0 10 8 * *"
   workflow_dispatch:
 
 jobs:

.github/workflows/CI_conda_forge.yml

@@ -4,10 +4,7 @@ name: conda-forge
 
 on:
   schedule:
-    # Run at the 0th minute of the 10th hour (UTC).
-    # This means the job will run at 5am EST.
-    - cron: "0 10 * * *"
-    # This will automatically run on master branch only.
+    - cron: "0 10 * * 1"
   workflow_dispatch:
 
 jobs:

.github/workflows/CI_docker.yml

@@ -1,18 +1,8 @@
 name: Docker
 
 on:
-  push:
-    branches:
-      - 'master'
-    paths:
-      - '**'
-    tags:
-      - 'v*.*.*'
-  pull_request:
-    branches:
-      - 'master'
-    paths:
-      - '**'
+  schedule:
+    - cron: "0 10 1 * *"
   workflow_dispatch:
 
 jobs:

.github/workflows/CI_docker_large_nightly.yml

@@ -2,15 +2,19 @@ name: Docker_Large_Nightly
 
 on:
   schedule:
-    # Run at the 0th minute of the 10th hour (UTC).
-    # This means the job will run at 5am EST.
-    - cron: "0 10 * * *"
-    # This will automatically run on master branch only.
+    - cron: "0 10 15 * *"
   workflow_dispatch:
+    inputs:
+      include-arm64:
+        description: "Also run a slow linux/arm64 QEMU smoke test"
+        required: false
+        default: false
+        type: boolean
 
 jobs:
   test:
     runs-on: ${{ matrix.os }}
+    if: ${{ matrix.arch != 'linux/arm64' || (github.event_name == 'workflow_dispatch' && inputs.include-arm64) }}
     continue-on-error: ${{ matrix.arch == 'linux/arm64' }}
     defaults:
       run:

.github/workflows/CI_mac.yml

@@ -15,6 +15,10 @@ on:
       - '**'
   workflow_dispatch:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
 jobs:
   test:
     runs-on: ${{ matrix.os }}

.github/workflows/docker_deploy.yml

@@ -1,8 +1,6 @@
 name: Deploy Docker
 
 on:
-  schedule:
-    - cron: "0 10 * * *"
   push:
     branches:
       - "master"

.github/workflows/docs.yml

@@ -20,6 +20,10 @@ on:
       - 'README.md'
   workflow_dispatch:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
 permissions:
   contents: write
   pull-requests: read

.github/workflows/update_backend.yml

@@ -3,6 +3,12 @@ on:
   schedule:
     - cron: '00 00 * * *'
   workflow_dispatch:
+    inputs:
+      force:
+        description: "Force update even if an open PR already exists"
+        required: false
+        default: false
+        type: boolean
 
 permissions:
   contents: write
@@ -17,7 +23,6 @@ jobs:
       - uses: actions/setup-python@v6
         with:
           python-version: '3'
-          cache: pip
 
       - name: "Install dependencies"
         run: python -m pip install --upgrade pip
@@ -30,12 +35,25 @@ jobs:
           cd SymbolicRegression.jl
           echo "version=$(git describe --tags --match='v*' --abbrev=0 | sed 's/^v//')" >> $GITHUB_OUTPUT
 
+      - name: "Check for existing open PR"
+        id: existing-pr
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          if gh pr list --repo "$GITHUB_REPOSITORY" --head "backend-update/v${{ steps.get-latest.outputs.version }}" --state open | grep -q .; then
+            echo "exists=true" >> $GITHUB_OUTPUT
+          else
+            echo "exists=false" >> $GITHUB_OUTPUT
+          fi
+
       - name: "Update SymbolicRegression.jl version in PySR"
+        if: ${{ steps.existing-pr.outputs.exists != 'true' || (github.event_name == 'workflow_dispatch' && inputs.force) }}
         run: |
           python .github/workflows/update_backend_version.py ${{ steps.get-latest.outputs.version }}
 
       - name: "Create PR if necessary"
         id: cpr
+        if: ${{ steps.existing-pr.outputs.exists != 'true' || (github.event_name == 'workflow_dispatch' && inputs.force) }}
         uses: peter-evans/create-pull-request@v8
         with:
           branch: backend-update/v${{ steps.get-latest.outputs.version }}
@@ -50,15 +68,11 @@ jobs:
             pysr/juliapkg.json
 
       - name: "Trigger CI workflows (backend update PR)"
-        if: steps.cpr.outputs.pull-request-number != ''
+        if: ${{ steps.cpr.outputs.pull-request-number != '' || (github.event_name == 'workflow_dispatch' && inputs.force) }}
         env:
           GH_TOKEN: ${{ github.token }}
         run: |
           ref="backend-update/v${{ steps.get-latest.outputs.version }}"
           gh workflow run "Linux" --repo "$GITHUB_REPOSITORY" --ref "$ref" || true
           gh workflow run "Windows" --repo "$GITHUB_REPOSITORY" --ref "$ref" || true
           gh workflow run "macOS" --repo "$GITHUB_REPOSITORY" --ref "$ref" || true
-          gh workflow run "Docker" --repo "$GITHUB_REPOSITORY" --ref "$ref" || true
-          gh workflow run "Apptainer" --repo "$GITHUB_REPOSITORY" --ref "$ref" || true
-          gh workflow run "Documentation" --repo "$GITHUB_REPOSITORY" --ref "$ref" || true
-          gh workflow run "CodeQL" --repo "$GITHUB_REPOSITORY" --ref "$ref" || true