release: change ubuntu-x86 target to musl (directly to master)

This will avoid nasty bugs with glibc using dlopen for libnss
and causing segfault if library versions are different.

.github/workflows/release.yaml

@@ -82,7 +82,7 @@ jobs:
         - build: ubuntu-x86
           os: ubuntu-latest
           rust: stable
-          target: x86_64-unknown-linux-gnu
+          target: x86_64-unknown-linux-musl
         # - build: ubuntu-aarch64
         #   os: ubuntu-latest
         #   rust: stable
@@ -105,7 +105,7 @@ jobs:
       if: matrix.os == 'ubuntu-latest'
       run: |-
           sudo apt-get update
-          sudo apt-get install -y openssl ca-certificates pkg-config cmake libssl-dev
+          sudo apt-get install -y build-essential musl-tools
 
     - name: Install packages (MacOS)
       if: matrix.os == 'macos-latest'
@@ -131,7 +131,7 @@ jobs:
 
     - name: Use Cross
       # Build without Cross for native target
-      if: matrix.os == 'ubuntu-latest' && matrix.target != 'x86_64-unknown-linux-gnu'
+      if: matrix.os == 'ubuntu-latest' && matrix.target != 'x86_64-unknown-linux-musl'
       run: |
         # In the past, new releases of 'cross' have broken CI. So for now, we
         # pin it. We also use their pre-compiled binary releases because cross