GHA: Add win64 cross compile build

This also removes -t from docker run, as we don't actually require a
terminal, this was just muscle memory.

This also archives the artifacts for testing.

.github/workflows/build.yml

@@ -125,6 +125,29 @@ jobs:
       run: |
         rm -rf "$DF_FOLDER"
 
+  build-cross-win64:
+    name: Build MSVC win64
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Clone DFHack
+        uses: actions/checkout@v3
+        with:
+          submodules: true
+          fetch-depth: 0
+      - name: Cross-compile win64 artifacts
+        run: |
+          cd build
+          bash -x build-win64-from-linux.sh
+      - name: Format artifact name
+        id: artifactname
+        run: |
+          echo name=$(date +%Y%m%d)-$(git rev-parse --short $GITHUB_REF) >> $GITHUB_OUTPUT
+      - name: Upload win64 artifacts
+        uses: actions/upload-artifact@v3
+        with:
+          name: dfhack-win64-build-${{ steps.artifactname.outputs.name }}
+          path: build/win64-cross/output/*
+
   docs:
     runs-on: ubuntu-18.04
     steps:

build/build-win64-from-linux.sh

@@ -37,10 +37,11 @@ fi
 #
 # NOTE: win64-cross is mounted in /src/build due to the hardcoded `cmake ..` in
 # the Dockerfile
-if ! docker run --rm -it -v "$srcdir":/src -v "$srcdir/build/win64-cross/":/src/build  \
+if ! docker run --rm -i -v "$srcdir":/src -v "$srcdir/build/win64-cross/":/src/build  \
     -e BUILDER_UID=$builder_uid \
     --name dfhack-win \
-    dfhack-build-msvc bash -c "cd /src/build && dfhack-configure windows 64 Release -DCMAKE_INSTALL_PREFIX=/src/build/output cmake .. -DBUILD_DOCS=1 && dfhack-make -j$jobs install" \
+    ghcr.io/dfhack/build-env:msvc \
+    bash -c "cd /src/build && dfhack-configure windows 64 Release -DCMAKE_INSTALL_PREFIX=/src/build/output cmake .. -DBUILD_DOCS=1 && dfhack-make -j$jobs install" \
     ; then
     echo
     echo "Build failed"