workflows: Add nightly builds

CI build time has doubled due to GitHub Actions being limited to 20 parallel workflow runs, so only build the firmware for Release on a "nightly" schedule in order to halve the number of runs.

Also ignore markdown documentation changes and allow manual dispatch.

.github/workflows/build.yml

@@ -1,12 +1,21 @@
 name: Build
 on:
   push:
+    paths-ignore:
+      - '**.md'
     branches:
       - master
   pull_request:
+    paths-ignore:
+      - '**.md'
     branches:
       - master
   workflow_call:
+    inputs:
+      build-configs:
+        type: string
+        required: true
+  workflow_dispatch:
 
 jobs:
   build:
@@ -26,13 +35,13 @@ jobs:
           - edge2
           - nanopc-t6
           # - rk3588-evb is currently failing
-        CONFIGURATION: [Debug, Release]
+        CONFIGURATION: ${{ fromJSON(format('[{0}]', inputs.build-configs || '"Debug"')) }}
     steps:
       - name: Checkout
         uses: actions/checkout@v3
         with:
           submodules: recursive
-        
+
       - name: Install dependencies
         shell: bash
         run: |
@@ -48,18 +57,18 @@ jobs:
           libc6-dev-arm64-cross \
           python3 \
           python3-pyelftools
-          
+
       - name: Get version tag
         id: get_version_tag
         shell: bash
         run: echo "version=$(git describe --tags --always)" >> $GITHUB_OUTPUT
-        
+
       - name: Build platform
         shell: bash
-        run: |  
+        run: |
          ./build.sh --device ${{matrix.PLATFORM}} --release ${{matrix.CONFIGURATION}}
           mv RK3588_NOR_FLASH.img ${{matrix.PLATFORM}}_UEFI_${{matrix.CONFIGURATION}}_${{steps.get_version_tag.outputs.version}}.img
-        
+
       - name: Upload artifact
         uses: actions/upload-artifact@v3
         with:

.github/workflows/nightly.yml

@@ -0,0 +1,41 @@
+name: Nightly
+run-name: Nightly build
+on:
+  schedule:
+    - cron: "0 0 * * *"
+
+jobs:
+  prepare:
+    runs-on: ubuntu-latest
+    permissions:
+      actions: write
+    steps:
+      - name: Delete previous cancelled runs
+        uses: Mattraks/delete-workflow-runs@v2
+        with:
+          retain_days: 0
+          keep_minimum_runs: 0
+          delete_workflow_pattern: ${{ github.workflow }}
+          delete_run_by_conclusion_pattern: cancelled
+
+      - name: Check for new commits
+        id: check-new-commits
+        uses: adriangl/check-new-commits-action@v1
+        with:
+          seconds: 86400 # One day in seconds
+          branch: 'master'
+
+      - name: Cancel action if no new commits
+        if: ${{ steps.check-new-commits.outputs.has-new-commits != 'true' }}
+        uses: andymckay/cancel-action@0.3
+
+      - name: Wait for cancellation
+        if: ${{ steps.check-new-commits.outputs.has-new-commits != 'true' }}
+        shell: bash
+        run: while true; do echo "Waiting for job to be cancelled"; sleep 5; done
+
+  build_for_nightly:
+    needs: prepare
+    uses: ./.github/workflows/build.yml
+    with:
+      build-configs: '"Debug", "Release"'

.github/workflows/release.yml

@@ -1,13 +1,15 @@
 name: Release
-on:  
+on:
   push:
     tags:
       - '*'
-      
+
 jobs:
   build_for_release:
     uses: ./.github/workflows/build.yml
-  
+    with:
+      build-configs: '"Debug", "Release"'
+
   release:
     runs-on: ubuntu-latest
     needs: build_for_release
@@ -16,7 +18,7 @@ jobs:
     steps:
       - name: Download all workflow run artifacts
         uses: actions/download-artifact@v3
-          
+
       - name: Create release
         uses: softprops/action-gh-release@v1
         with: