Add visibility-based runner selection to workflows

Author: GOB52

.github/workflows/arduino-esp-v2-build-check.yml

@@ -47,7 +47,7 @@ concurrency:
 jobs:
   build:
     name: ${{ matrix.build-properties }}:${{ matrix.sketch }}:${{matrix.board}}@${{matrix.platform-version}}
-    runs-on: ubuntu-latest
+    runs-on: ${{ github.event.repository.private && 'self-hosted' || 'ubuntu-latest' }}
     timeout-minutes: 12
 
     strategy:

.github/workflows/arduino-esp-v3-build-check.yml

@@ -47,7 +47,7 @@ concurrency:
 jobs:
   build:
     name: ${{ matrix.build-properties }}:${{ matrix.sketch }}:${{matrix.board}}@${{matrix.platform-version}}
-    runs-on: ubuntu-latest
+    runs-on: ${{ github.event.repository.private && 'self-hosted' || 'ubuntu-latest' }}
     timeout-minutes: 12
 
     strategy:

.github/workflows/arduino-m5-build-check.yml

@@ -47,7 +47,7 @@ concurrency:
 jobs:
   build:
     name: ${{ matrix.build-properties }}:${{ matrix.sketch }}:${{matrix.board}}@${{matrix.platform-version}}
-    runs-on: ubuntu-latest
+    runs-on: ${{ github.event.repository.private && 'self-hosted' || 'ubuntu-latest' }}
     timeout-minutes: 12
 
     strategy:

.github/workflows/clang-format-check.yml

@@ -42,7 +42,7 @@ concurrency:
 jobs:
   formatting-check:
     name: Formatting Check
-    runs-on: ubuntu-latest
+    runs-on: ${{ github.event.repository.private && 'self-hosted' || 'ubuntu-latest' }}
     strategy:
       matrix:
         path:

.github/workflows/firmware-cardkb-build.yml

@@ -30,7 +30,7 @@ concurrency:
 jobs:
   build:
     name: ${{ matrix.sketch }}:${{matrix.board}}@${{matrix.platform-version}}
-    runs-on: ubuntu-latest
+    runs-on: ${{ github.event.repository.private && 'self-hosted' || 'ubuntu-latest' }}
     timeout-minutes: 12
 
     strategy:

.github/workflows/firmware-faces-build.yml

@@ -30,7 +30,7 @@ concurrency:
 jobs:
   build:
     name: ${{ matrix.sketch }}:${{matrix.board}}@${{matrix.platform-version}}
-    runs-on: ubuntu-latest
+    runs-on: ${{ github.event.repository.private && 'self-hosted' || 'ubuntu-latest' }}
     timeout-minutes: 12
 
     strategy:

.github/workflows/platformio-build-check.yml

@@ -45,7 +45,7 @@ concurrency:
 jobs:
   build:
     name: ${{ matrix.unit }}:${{ matrix.example }}@${{ matrix.board }}:${{ matrix.framework }}:${{ matrix.espressif32 }}
-    runs-on: ubuntu-latest
+    runs-on: ${{ github.event.repository.private && 'self-hosted' || 'ubuntu-latest' }}
     timeout-minutes: 12
 
     strategy: