Add static musl builds for Linux and conditional crate publishing (#10)

* Release workflow now skips Cargo crate publishing if CARGO_REGISTRY_TOKEN is missing

* Dynamically link amd64 linux build on lower Ubuntu version for better glibc compatibility, add statically-linked musl compilation targets

* Add build step to install missing musl-tool dependencies for musl targets

---------

Co-authored-by: Mattias Aabmets <mattias.aabmets@tietoevry.com>

Author: aabmets

.github/workflows/release.yml

@@ -26,6 +26,7 @@ jobs:
     outputs:
       version: ${{ steps.check.outputs.version }}
       is_release: ${{ steps.check.outputs.is_release }}
+      has_token: ${{ steps.check.outputs.has_token }}
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
@@ -65,12 +66,19 @@ jobs:
             echo "ℹ️  Version normalized to: $version"
           fi
 
+          has_token="false"
+          if [ -n "${{ secrets.CARGO_REGISTRY_TOKEN }}" ]; then
+            has_token="true"
+          fi
+
           echo "version=$version" >> $GITHUB_OUTPUT
           echo "is_release=$is_release" >> $GITHUB_OUTPUT
+          echo "has_token=$has_token" >> $GITHUB_OUTPUT
 
           echo "📊 Build Summary:"
           echo "  - Version: $version"
           echo "  - Is release: $is_release"
+          echo "  - Publish crate: $has_token"
 
   build:
     name: Build (${{ matrix.os_name }}-${{ matrix.arch }})
@@ -83,7 +91,7 @@ jobs:
       matrix:
         include:
           # Linux
-          - os: ubuntu-latest
+          - os: ubuntu-22.04
             target: x86_64-unknown-linux-gnu
             os_name: linux
             arch: amd64
@@ -96,6 +104,20 @@ jobs:
             artifact_name: rc
             cross: true
 
+          - os: ubuntu-latest
+            target: x86_64-unknown-linux-musl
+            os_name: linux
+            arch: amd64-musl
+            artifact_name: rc
+            cross: false
+
+          - os: ubuntu-latest
+            target: aarch64-unknown-linux-musl
+            os_name: linux
+            arch: arm64-musl
+            artifact_name: rc
+            cross: true
+
           # macOS (both targets built on ARM64 runner with cross-compilation)
           - os: macos-latest
             target: x86_64-apple-darwin
@@ -130,6 +152,13 @@ jobs:
         with:
           key: ${{ matrix.target }}
 
+      - name: Add Rust target
+        run: rustup target add ${{ matrix.target }}
+
+      - name: Install musl-tools
+        if: contains(matrix.target, 'musl')
+        run: sudo apt-get update && sudo apt-get install -y musl-tools
+
       # Install cross for cross-compilation
       - name: Install cross
         if: matrix.cross
@@ -407,7 +436,7 @@ jobs:
 
             ```bash
             brew tap rustfs/homebrew-tap
-            
+
             brew install rustfs/tap/rc
             ```
 
@@ -424,7 +453,7 @@ jobs:
     name: Publish to crates.io
     needs: [ build-check, build ]
     runs-on: ubuntu-latest
-    if: needs.build-check.outputs.is_release == 'true'
+    if: needs.build-check.outputs.is_release == 'true' && needs.build-check.outputs.has_token == 'true'
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4