Fix remaining CI test failures on Linux

.github/workflows/tests.yml

@@ -110,6 +110,10 @@ jobs:
     runs-on: ${{ matrix.target.runner }}
     container:
       image: ghcr.io/inko-lang/ci:fedora
+    env:
+      # This is needed because when setting an explicit target, "ring" looks for
+      # `aarch64-linux-musl-gcc` instead of using `musl-gcc`.
+      CC_aarch64_unknown_linux_musl: musl-gcc
     steps:
       - uses: actions/checkout@v4
       - uses: actions/cache@v4
@@ -121,7 +125,7 @@ jobs:
       - name: Build the compiler
         run: INKO_RT="${PWD}/target/${{ matrix.target.triple }}/debug" cargo build -p inko
       - name: Run the tests
-        run: 'cd std && ../target/${{ matrix.target.triple }}/debug/inko test --opt=${{ matrix.level }} --target=${{ matrix.name }}'
+        run: 'cd std && ../target/debug/inko test --opt=${{ matrix.level }} --target=${{ matrix.target.name }}'
 
   compiler-mac:
     strategy: