Add musl workflows

.github/workflows/linux-500-musl.yml

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+name: musl 5.0.0
+
+on:
+  schedule:
+    # Every Sunday morning, at 1:11 UTC
+    - cron: '11 1 * * 0'
+  workflow_dispatch:
+
+jobs:
+  build:
+    uses: ./.github/workflows/common.yml
+    with:
+      compiler_ref: refs/tags/5.0.0
+      options: musl
+      timeout: 240

.github/workflows/linux-51x-musl.yml

@@ -0,0 +1,15 @@
+name: musl 5.1
+
+on:
+  schedule:
+    # Every Sunday morning, at 2:22 UTC
+    - cron: '22 2 * * 0'
+  workflow_dispatch:
+
+jobs:
+  build:
+    uses: ./.github/workflows/common.yml
+    with:
+      compiler_ref: refs/tags/5.1.1
+      options: musl
+      timeout: 240

.github/workflows/linux-520-musl.yml

@@ -0,0 +1,15 @@
+name: musl 5.2
+
+on:
+  schedule:
+    # Every Monday morning, at 1:11 UTC
+    - cron: '11 1 * * 1'
+  workflow_dispatch:
+
+jobs:
+  build:
+    uses: ./.github/workflows/common.yml
+    with:
+      compiler_ref: refs/tags/5.2.0
+      options: musl
+      timeout: 240

.github/workflows/linux-530-trunk-musl.yml

@@ -0,0 +1,19 @@
+name: musl 5.3
+
+on:
+  schedule:
+    # Every Monday morning, at 2:22 UTC
+    - cron: '22 2 * * 1'
+  pull_request:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
+jobs:
+  build:
+    uses: ./.github/workflows/common.yml
+    with:
+      compiler_ref: refs/heads/5.3
+      options: musl
+      timeout: 240

.github/workflows/linux-540-trunk-musl.yml

@@ -0,0 +1,19 @@
+name: musl trunk
+
+on:
+  schedule:
+    # Every Monday morning, at 3:33 UTC
+    - cron: '33 3 * * 1'
+  pull_request:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
+jobs:
+  build:
+    uses: ./.github/workflows/common.yml
+    with:
+      compiler_ref: refs/heads/trunk
+      options: musl
+      timeout: 240