Add Homebrew bin directory to path on GHA macOS workers (#41)

GCC is no longer installed in `/usr/local/bin` on the macOS 14 GitHub
runners, which is what `macos-latest` now points to. Look for it in
`/opt/homebrew/bin` instead.

It's also becoming harder to maintain a `.plzconfig` that works on both
macOS and Ubuntu runners at the same time, so have separate
configurations for each platform and compiler.

Author: chrisnovakovic

Diff for: .github/workflows/plugin.yaml

@@ -4,17 +4,17 @@ on:
   - pull_request
 jobs:
   test:
-    runs-on: ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}-latest
     steps:
       - name: Checkout code
         uses: actions/checkout@v2
       - name: Install nasm
-        if: ${{ matrix.os == 'macos-latest' }}
+        if: ${{ matrix.os == 'macos' }}
         run: brew install nasm
       - name: Run tests
-        run: ./pleasew test -e e2e --profile ${{ matrix.compiler }} --log_file plz-out/log/test.log
+        run: ./pleasew test -e e2e --profile gha_${{ matrix.os }}_${{ matrix.compiler }} --log_file plz-out/log/test.log
       - name: Run e2e test
-        run: ./pleasew test -i e2e --profile ${{ matrix.compiler }} --log_file plz-out/log/e2e.log
+        run: ./pleasew test -i e2e --profile gha_${{ matrix.os }}_${{ matrix.compiler }} --log_file plz-out/log/e2e.log
       - name: Archive logs
         if: always()
         uses: actions/upload-artifact@v4
@@ -25,8 +25,8 @@ jobs:
       fail-fast: false
       matrix:
         os:
-          - ubuntu-latest
-          - macos-latest
+          - ubuntu
+          - macos
         compiler:
           - gcc
           - clang

Diff for: .plzconfig.gha_macos_clang

@@ -0,0 +1,10 @@
+[build]
+path = /opt/homebrew/bin:/usr/local/bin:/usr/bin:/bin
+
+[plugin "cc"]
+cctool = clang
+cpptool = clang++
+ldtool = lld
+defaultdbgcppflags = --std=c++1z -g3 -DDEBUG -Wall -Wextra -Werror -Wno-unused-parameter
+defaultoptcppflags = --std=c++1z -O2 -DNDEBUG -Wall -Wextra -Werror -Wno-unused-parameter
+clangmodules = true

Diff for: .plzconfig.gha_macos_gcc

@@ -0,0 +1,10 @@
+[build]
+path = /opt/homebrew/bin:/usr/local/bin:/usr/bin:/bin
+
+[plugin "cc"]
+cctool = gcc-12
+cpptool = g++-12
+ldtool = gold
+defaultdbgcppflags = --std=c++1z -g3 -DDEBUG -Wall -Wextra -Werror -Wno-unused-parameter
+defaultoptcppflags = --std=c++1z -O2 -DNDEBUG -Wall -Wextra -Werror -Wno-unused-parameter
+clangmodules = false