freebsd: fix CI for Zig 0.15 and enable FreeBSD 15.0

.github/workflows/test.yml

@@ -563,6 +563,8 @@ jobs:
   test:
     if: github.repository == 'ghostty-org/ghostty'
     runs-on: namespace-profile-ghostty-md
+    outputs:
+      zig_version: ${{ steps.zig.outputs.version }}
     env:
       ZIG_LOCAL_CACHE_DIR: /zig/local-cache
       ZIG_GLOBAL_CACHE_DIR: /zig/global-cache
@@ -570,6 +572,11 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
 
+      - name: Get required Zig version
+        id: zig
+        run: |
+          echo "version=$(sed -n -e 's/^.*requireZig("\(.*\)").*$/\1/p' build.zig)" >> $GITHUB_OUTPUT
+
       - name: Setup Cache
         uses: namespacelabs/nscloud-cache-action@7baedde84bbf5063413d621f282834bc2654d0c1 # v1.2.18
         with:
@@ -1137,12 +1144,11 @@ jobs:
     name: Build on FreeBSD
     needs: test
     runs-on: namespace-profile-mitchellh-sm-systemd
-    if: false # FIXME: FreeBSD does not yet ship with Zig 0.15
     strategy:
       matrix:
         release:
           - "14.3"
-          # - "15.0" # disable until fixed: https://github.com/vmactions/freebsd-vm/issues/108
+          - "15.0"
     steps:
       - name: Checkout Ghostty
         uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
@@ -1163,14 +1169,19 @@ jobs:
               devel/gettext \
               devel/git \
               devel/pkgconf \
+              ftp/curl \
               graphics/wayland \
-              lang/zig \
               security/ca_root_nss \
               textproc/hs-pandoc \
               x11-fonts/jetbrains-mono \
               x11-toolkits/libadwaita \
               x11-toolkits/gtk40 \
               x11-toolkits/gtk4-layer-shell
+            curl -L -o /tmp/zig.tar.xz "https://ziglang.org/download/${{ needs.test.outputs.zig_version }}/zig-x86_64-freebsd-${{ needs.test.outputs.zig_version }}.tar.xz" && \
+              mkdir /opt && \
+              tar -xf /tmp/zig.tar.xz -C /opt && \
+              rm /tmp/zig.tar.xz && \
+              ln -s "/opt/zig-x86_64-freebsd-${{ needs.test.outputs.zig_version }}/zig" /usr/local/bin/zig
 
           run: |
             zig env