fix(ci): use macos-15 for PostgreSQL x86_64 build with cross-compilation

macos-13 runners are deprecated. Cross-compile x86_64 on macos-15 ARM
runner via -arch x86_64 passed through PG_EXTRA_CFLAGS. Also pass
PG_EXTRA_CFLAGS to linker for arch flag propagation.

Author: andinux

.github/workflows/main.yml

@@ -282,7 +282,7 @@ jobs:
           - os: macos-15
             arch: arm64
             name: macos
-          - os: macos-13
+          - os: macos-15
             arch: x86_64
             name: macos
     steps:
@@ -309,7 +309,7 @@ jobs:
 
       - name: build and package postgresql extension (macos)
         if: matrix.name == 'macos'
-        run: make postgres-package PG_CONFIG=$(brew --prefix postgresql@17)/bin/pg_config PG_EXTRA_CFLAGS="-I$(brew --prefix gettext)/include"
+        run: make postgres-package PG_CONFIG=$(brew --prefix postgresql@17)/bin/pg_config PG_EXTRA_CFLAGS="-I$(brew --prefix gettext)/include ${{ matrix.arch == 'x86_64' && '-arch x86_64' || '' }}"
 
       - uses: actions/upload-artifact@v4.6.2
         with:

docker/Makefile.postgresql

@@ -111,7 +111,7 @@ postgres-build: postgres-check
 		$(CC) $(PG_CPPFLAGS) $(PG_CFLAGS) -c $$src -o $${src%.c}.o || exit 1; \
 	done
 	@echo "Linking $(PG_EXTENSION_LIB)..."
-	$(CC) $(PG_LDFLAGS) -o $(PG_EXTENSION_LIB) $(PG_OBJS)
+	$(CC) $(PG_LDFLAGS) $(PG_EXTRA_CFLAGS) -o $(PG_EXTENSION_LIB) $(PG_OBJS)
 	@echo "Build complete: $(PG_EXTENSION_LIB)"
 
 # Install extension to PostgreSQL