Build musl Debian packages in addition to glibc

Closes str4d/rage#252.

.github/workflows/release.yml

@@ -118,7 +118,7 @@ jobs:
     runs-on: ubuntu-18.04
     strategy:
       matrix:
-        name: [linux, armv7, arm64]
+        name: [linux, linux-musl, armv7, armv7-musl, arm64, arm64-musl]
         include:
           - name: linux
             target: x86_64-unknown-linux-gnu
@@ -126,6 +126,12 @@ jobs:
               libfuse-dev
             build_flags: --features mount
 
+          - name: linux-musl
+            target: x86_64-unknown-linux-musl
+            build_deps: >
+              musl-tools
+            deb_flags: --variant=musl
+
           - name: armv7
             target: armv7-unknown-linux-gnueabihf
             build_deps: >
@@ -134,6 +140,16 @@ jobs:
               [target.armv7-unknown-linux-gnueabihf]
               linker = "arm-linux-gnueabihf-gcc"
 
+          - name: armv7-musl
+            target: armv7-unknown-linux-musleabihf
+            build_deps: >
+              gcc-arm-linux-gnueabihf
+              musl-tools
+            cargo_config: |
+              [target.armv7-unknown-linux-musleabihf]
+              linker = "arm-linux-gnueabihf-gcc"
+            deb_flags: --variant=musl
+
           - name: arm64
             target: aarch64-unknown-linux-gnu
             build_deps: >
@@ -142,6 +158,16 @@ jobs:
               [target.aarch64-unknown-linux-gnu]
               linker = "aarch64-linux-gnu-gcc"
 
+          - name: arm64-musl
+            target: aarch64-unknown-linux-musl
+            build_deps: >
+              gcc-aarch64-linux-gnu
+              musl-tools
+            cargo_config: |
+              [target.aarch64-unknown-linux-musl]
+              linker = "aarch64-linux-gnu-gcc"
+            deb_flags: --variant=musl
+
     steps:
       - uses: actions/checkout@v3
       - uses: actions-rs/toolchain@v1
@@ -190,7 +216,7 @@ jobs:
         uses: actions-rs/cargo@v1
         with:
           command: deb
-          args: --package rage --no-build --target ${{ matrix.target }}
+          args: --package rage --no-build --target ${{ matrix.target }} ${{ matrix.deb_flags }}
 
       - name: Upload Debian package to release
         uses: svenstaro/upload-release-action@2.2.1

rage/Cargo.toml

@@ -13,6 +13,7 @@ default-run = "rage"
 
 [package.metadata.deb]
 name = "rage"
+conflicts = "rage-musl"
 extended-description = """\
 age is a simple, modern, and secure encryption format with small explicit keys, \
 no config options, and UNIX-style composability. rage is a Rust implementation \
@@ -38,6 +39,15 @@ assets = [
 ]
 features = ["mount"]
 
+[package.metadata.deb.variants.musl]
+name = "rage-musl"
+conflicts = "rage"
+extended-description = """\
+age is a simple, modern, and secure encryption format with small explicit keys, \
+no config options, and UNIX-style composability. rage is a Rust implementation \
+of the age specification. This package is statically linked against musl."""
+features = []
+
 [badges]
 maintenance = { status = "experimental" }