Copy image from previous release

For some versions and architectures, which are not supported anymore,
upstream has shutdown the pkg site. For some of these architectures
there is no pkg files on the install media to bootstrap from. This
also means now that it's not possible to rebuild these images,
without removing these packages. We do this to avoid breaking our
users.

.github/workflows/build.yml

@@ -18,7 +18,6 @@ jobs:
         matrix:
           version:
             - '12.2'
-            - '12.4'
             - '13.0'
             - '13.1'
             - '13.2'
@@ -37,6 +36,18 @@ jobs:
                 name: arm64
                 qemu: aarch64
 
+          include:
+            - version: '12.4'
+              copy_from_previous_release: true
+              architecture:
+                name: arm64
+                qemu: aarch64
+
+            - version: '12.4'
+              architecture:
+                name: x86-64
+                qemu: x86
+
     steps:
       - name: Clone Repository
         uses: actions/checkout@v3
@@ -63,12 +74,22 @@ jobs:
         run: cp "$(cat /usr/share/qemu/firmware/60-edk2-aarch64.json | jq .mapping.executable.filename -r)" edk2-aarch64-code.fd
 
       - name: Build Image
+        if: '!matrix.copy_from_previous_release'
         env:
           PACKER_LOG: 1
         run: |
           ./build.sh '${{ matrix.version }}' '${{ matrix.architecture.name }}' \
             -var 'headless=true'
 
+      - name: Copy from previous release
+        if: matrix.copy_from_previous_release
+        run: |
+          curl -O -L \
+            --retry 3 \
+            --create-dirs \
+            --output-dir output \
+            https://github.com/cross-platform-actions/freebsd-builder/releases/download/v0.5.0/freebsd-${{ matrix.version }}-${{ matrix.architecture.name }}.qcow2
+
       - name: Extract Version
         id: version
         if: startsWith(github.ref, 'refs/tags/v')