CI: Add macos-15

Author: bonachea

.github/workflows/build.yml

@@ -10,10 +10,17 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [macos-13, macos-14, ubuntu-22.04, ubuntu-24.04]
+        os: [macos-13, macos-14, macos-15, ubuntu-22.04, ubuntu-24.04]
         compiler: [ gfortran ]
         version: [ 12, 13, 14 ]
         extra_flags: [ -ffree-line-length-0 ]
+
+        exclude:
+          - os: ubuntu-22.04
+            version: 13 # no package available
+          - os: ubuntu-22.04
+            version: 14 # no package available
+
         include:
           # https://hub.docker.com/r/phhargrove/llvm-flang/tags
           - os: ubuntu-24.04
@@ -45,12 +52,6 @@ jobs:
             extra_flags: -g
             container: intel/fortran-essentials:2025.0.0-0-devel-ubuntu22.04 
 
-        exclude:
-          - os: ubuntu-22.04
-            version: 13 # no package available
-          - os: ubuntu-22.04
-            version: 14 # no package available
-
     container:
       image: ${{ matrix.container }}
 
@@ -90,12 +91,14 @@ jobs:
 
     - name: Setup FPM
       uses: fortran-lang/setup-fpm@main
-      if: ${{ matrix.os != 'macos-14' }}
+      if: ${{ !contains(matrix.os, 'macos') || matrix.os == 'macos-13' }}
       with:
         github-token: ${{ secrets.GITHUB_TOKEN }}
+        fpm-version: latest
 
     - name: Build FPM
-      if: ${{ matrix.os == 'macos-14' }} # no arm64 fpm distro, build from source
+      # no macos-arm64 fpm distro, build from source
+      if: ${{ contains(matrix.os, 'macos') && matrix.os != 'macos-13' }}
       run: |
         set -x
         curl --retry 5 -LOsS https://github.com/fortran-lang/fpm/releases/download/v0.11.0/fpm-0.11.0.F90