Fix building the compiler on Alpine/musl

With https://gitlab.com/taricorp/llvm-sys.rs/-/issues/44 solved, it's
now possible to build the compiler on Alpine/musl targets. This commit
updates the LLVM dependencies for that, fixes a few deprecation
warnings, and updates the CI configuration such that we run tests on
Alpine.

Changelog: fixed

.github/workflows/runtimes.yml

@@ -9,8 +9,7 @@ env:
   RUSTUP_TOOLCHAIN: '1.78'
 
 jobs:
-  linux-amd64:
-    name: Linux AMD64
+  amd64-linux:
     runs-on: ubuntu-latest
     container:
       image: ghcr.io/inko-lang/ci:debian-amd64
@@ -26,8 +25,7 @@ jobs:
           retention-days: 2
           compression-level: 0
 
-  linux-arm64:
-    name: Linux ARM64
+  arm64-linux:
     runs-on: ubuntu-latest
     container:
       image: ghcr.io/inko-lang/ci:debian-arm64
@@ -43,8 +41,7 @@ jobs:
           retention-days: 2
           compression-level: 0
 
-  macos-amd64:
-    name: macOS AMD64
+  amd64-mac:
     runs-on: macos-12
     steps:
       - uses: actions/checkout@v4
@@ -60,8 +57,7 @@ jobs:
           retention-days: 2
           compression-level: 0
 
-  macos-arm64:
-    name: macOS ARM64
+  arm64-mac:
     runs-on: macos-14
     steps:
       - uses: actions/checkout@v4
@@ -77,8 +73,7 @@ jobs:
           retention-days: 2
           compression-level: 0
 
-  freebsd-amd64:
-    name: FreeBSD AMD64
+  amd64-freebsd:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
@@ -109,11 +104,11 @@ jobs:
       RCLONE_S3_SECRET_ACCESS_KEY: ${{ secrets.CLOUDFLARE_SECRET_ACCESS_KEY }}
       RCLONE_S3_ENDPOINT: https://${{ secrets.CLOUDFLARE_ACCOUNT_ID }}.r2.cloudflarestorage.com
     needs:
-      - linux-amd64
-      - linux-arm64
-      - macos-amd64
-      - macos-arm64
-      - freebsd-amd64
+      - amd64-linux
+      - arm64-linux
+      - amd64-mac
+      - arm64-mac
+      - amd64-freebsd
     steps:
       - uses: actions/checkout@v4
       - uses: actions/download-artifact@v4

.github/workflows/tests.yml

@@ -63,8 +63,7 @@ jobs:
       - name: Check the formatting
         run: 'cd std && cargo run -- fmt --check'
 
-  linux-amd64:
-    name: Linux AMD64
+  amd64-linux-gnu:
     runs-on: ubuntu-latest
     container:
       image: ghcr.io/inko-lang/ci:fedora
@@ -73,14 +72,28 @@ jobs:
       - uses: actions/cache@v4
         with:
           path: '${{ env.CARGO_HOME }}'
-          key: linux-amd64-${{ hashFiles('Cargo.lock', 'rust-toolchain.toml') }}
+          key: amd64-linux-gnu-${{ hashFiles('Cargo.lock', 'rust-toolchain.toml') }}
       - name: Run compiler tests
         run: cargo test
       - name: Run stdlib tests
         run: 'cd std && cargo run -- test'
 
-  macos-amd64:
-    name: macOS AMD64
+  amd64-linux-musl:
+    runs-on: ubuntu-latest
+    container:
+      image: ghcr.io/inko-lang/ci:alpine
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/cache@v4
+        with:
+          path: '${{ env.CARGO_HOME }}'
+          key: amd64-linux-musl-${{ hashFiles('Cargo.lock', 'rust-toolchain.toml') }}
+      - name: Run compiler tests
+        run: cargo test
+      - name: Run stdlib tests
+        run: 'cd std && cargo run -- test'
+
+  amd64-mac-native:
     runs-on: macos-12
     env:
       RUSTUP_HOME: ${{ github.workspace }}/.rustup-home
@@ -91,16 +104,15 @@ jobs:
           path: |
             ${{ env.CARGO_HOME }}
             ${{ env.RUSTUP_HOME }}
-          key: mac-amd64-${{ hashFiles('Cargo.lock', 'rust-toolchain.toml') }}
+          key: amd64-mac-native-${{ hashFiles('Cargo.lock', 'rust-toolchain.toml') }}
       - name: Install dependencies
         run: ./ci/mac.sh
       - name: Run compiler tests
         run: cargo test
       - name: Run stdlib tests
         run: 'cd std && cargo run -- test'
 
-  macos-arm64:
-    name: macOS ARM64
+  arm64-mac-native:
     runs-on: macos-14
     env:
       RUSTUP_HOME: ${{ github.workspace }}/.rustup-home
@@ -111,16 +123,15 @@ jobs:
           path: |
             ${{ env.CARGO_HOME }}
             ${{ env.RUSTUP_HOME }}
-          key: mac-arm64-${{ hashFiles('Cargo.lock', 'rust-toolchain.toml') }}
+          key: arm64-mac-native-${{ hashFiles('Cargo.lock', 'rust-toolchain.toml') }}
       - name: Install dependencies
         run: ./ci/mac.sh
       - name: Run compiler tests
         run: cargo test
       - name: Run stdlib tests
         run: 'cd std && cargo run -- test'
 
-  freebsd-amd64:
-    name: FreeBSD AMD64
+  amd64-freebsd-native:
     runs-on: ubuntu-latest
     env:
       RUSTUP_HOME: ${{ github.workspace }}/.rustup-home
@@ -131,7 +142,7 @@ jobs:
           path: |
             ${{ env.CARGO_HOME }}
             ${{ env.RUSTUP_HOME }}
-          key: freebsd-${{ hashFiles('Cargo.lock', 'rust-toolchain.toml') }}
+          key: amd64-freebsd-native-${{ hashFiles('Cargo.lock', 'rust-toolchain.toml') }}
       - name: Run tests
         uses: cross-platform-actions/[email protected]
         with: