Add os matrix to test best arm simulator

Author: nicodr97

.github/workflows/build.yml

@@ -26,6 +26,7 @@ jobs:
       matrix:
         arch: [x86, x86_64, armv7, aarch64]
         cpu_instr: [non-SIMD, SSE2, auto-selected]
+        os: [ubuntu, alpine]
 
     steps:
       - uses: actions/checkout@v3
@@ -85,18 +86,18 @@ jobs:
           shell-name: alpine-armv7.sh
 
       - name: Build trimal for Linux armv7 (alpine)
-        if: matrix.arch == 'armv7' && matrix.cpu_instr == 'non-SIMD' 
+        if: matrix.arch == 'armv7' && matrix.cpu_instr == 'non-SIMD' && matrix.os == 'alpine'
         run: cmake . -DDISABLE_SSE2=1 -DDISABLE_AVX2=1 && make && file bin/trimal && file bin/readal &&
           ./scripts/generate_trimmed_msas.sh && ./scripts/compare_trimmed_msas.sh 
         shell: alpine-armv7.sh {0}
       - name: Build trimal for Linux armv7 (alpine) and auto-selected SIMD (NEON)
-        if: matrix.arch == 'armv7' && matrix.cpu_instr == 'auto-selected' 
+        if: matrix.arch == 'armv7' && matrix.cpu_instr == 'auto-selected' && matrix.os == 'alpine'
         run: cmake . && make && file bin/trimal && file bin/readal &&
           ./scripts/generate_trimmed_msas.sh && ./scripts/compare_trimmed_msas.sh 
         shell: alpine-armv7.sh {0}
 
       - name: Build trimal for Linux armv7 (ubuntu)
-        if: matrix.arch == 'armv7' && matrix.cpu_instr == 'non-SIMD'
+        if: matrix.arch == 'armv7' && matrix.cpu_instr == 'non-SIMD' && matrix.os == 'ubuntu'
         uses: uraimo/run-on-arch-action@v2
         # Emulate ARM architecture since it's not natively supported by GitHub. 
         # Warning about image and host platforms not matching may be ignored (https://github.com/uraimo/run-on-arch-action/issues/127#issuecomment-1605691328)
@@ -114,7 +115,7 @@ jobs:
             ./scripts/generate_trimmed_msas.sh && ./scripts/compare_trimmed_msas.sh
 
       - name: Build trimal for Linux armv7 (ubuntu) and auto-selected SIMD (NEON)
-        if: matrix.arch == 'armv7' && matrix.cpu_instr == 'auto-selected'
+        if: matrix.arch == 'armv7' && matrix.cpu_instr == 'auto-selected' && matrix.os == 'ubuntu'
         uses: uraimo/run-on-arch-action@v2
         # Emulate ARM architecture since it's not natively supported by GitHub. 
         # Warning about image and host platforms not matching may be ignored (https://github.com/uraimo/run-on-arch-action/issues/127#issuecomment-1605691328)