test macos 15 too

Author: Anton-4

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ${{ matrix.operating-system }}
     strategy:
       matrix:
-        operating-system: [ubuntu-22.04, ubuntu-24.04, ubuntu-24.04-arm]
+        operating-system: [ubuntu-22.04, ubuntu-24.04, ubuntu-24.04-arm, macos-15]
     steps:
       - uses: actions/checkout@v4
 
@@ -26,6 +26,8 @@ jobs:
         run: |
           if [[ "${{ runner.os }}-${{ runner.arch }}" == "Linux-ARM64" ]]; then
             curl -fOL https://github.com/roc-lang/roc/releases/download/nightly/roc_nightly-linux_arm64-latest.tar.gz
+          elif [[ "${{ runner.os }}" == "macOS" ]]; then
+            curl -fOL https://github.com/roc-lang/roc/releases/download/nightly/roc_nightly-macos_apple_silicon-latest.tar.gz
           else
             curl -fOL https://github.com/roc-lang/roc/releases/download/nightly/roc_nightly-linux_x86_64-latest.tar.gz
           fi
@@ -43,19 +45,26 @@ jobs:
 
       - run: ./roc_nightly/roc version
 
-      - run: |
+      - name: Install dependencies (Ubuntu)
+        if: startsWith(matrix.os, 'ubuntu-')
+        run: |
           sudo apt update
-          sudo apt install -y expect ncat valgrind ripgrep
-      # expect for testing
-      # ncat for tcp-client example
-      # ripgrep for ci/check_all_exposed_funs_tested.roc
+          sudo apt install -y expect ncat ripgrep
+
+      - name: Install dependencies (macOS)
+        if: startsWith(matrix.os, 'macos-')
+        run: |
+          brew install expect # expect for testing
+          brew install nmap  # includes ncat, for tcp-client example
+          brew install ripgrep # ripgrep for ci/check_all_exposed_funs_tested.roc
 
       - run: expect -v
 
       - name: Run all tests
         run: ROC=./roc_nightly/roc EXAMPLES_DIR=./examples/ ./ci/all_tests.sh
 
       - name: Install dependencies for musl build
+        if: startsWith(matrix.os, 'ubuntu-')
         run: |
           sudo apt-get install -y musl-tools
           if [[ "${{ matrix.operating-system }}" == *"-arm" ]]; then
@@ -66,6 +75,7 @@ jobs:
           fi
 
       - name: Test building with musl target
+        if: startsWith(matrix.os, 'ubuntu-')
         env:
           ROC: ./roc_nightly/roc
         run: |
@@ -77,6 +87,7 @@ jobs:
           fi
 
       - name: Test using musl build
+        if: startsWith(matrix.os, 'ubuntu-')
         run: |
           # TODO remove `if` when above TODOs are done
           if [[ "${{ matrix.operating-system }}" != *"-arm" ]]; then