Update CI setup again

(I hate this so much)

.github/workflows/ci.yml

@@ -13,22 +13,22 @@ jobs:
         working-directory: ./src/spice2x
     steps:
       - uses: actions/checkout@v5
-      - name: Set ccache environment variables
-        run: |
-          echo "CCACHE_DIR=${{ github.workspace }}/src/spice2x/.ccache" >> $GITHUB_ENV
-      - name: Install ccache
-        uses: hendrikmuhs/ccache-action@v1.2.23
-        with:
-          update-package-index: true
       - name: Calculate commit SHA
         id: vars
         run: |
           calculatedSha=$(git rev-parse --short ${{ github.sha }})
-          echo "COMMIT_SHORT_SHA=$calculatedSha" >> $GITHUB_ENV
+          echo "sha=$calculatedSha" >> "$GITHUB_OUTPUT"
+          echo "bin=${{ github.workspace }}/src/spice2x/bin" >> "$GITHUB_OUTPUT"
       - name: Compile
-        run: ./build_docker.sh
+        run: |
+          docker build --pull "$PWD/external/docker" -t spicetools/deps --platform linux/x86_64
+          docker build --build-context gitroot="$PWD/../../.git" . -t spicetools/spice:latest
+          docker run --name spice-build spicetools/spice:latest
+          mkdir -p "$PWD/bin"
+          docker cp spice-build:/src/src/spice2x/bin/. "$PWD/bin"
+          docker rm spice-build
       - uses: actions/upload-artifact@v6
         with:
-          name: spice2x-ci-${{ env.COMMIT_SHORT_SHA }}
-          path: ${{ github.workspace }}/src/spice2x/bin
+          name: spice2x-ci-${{ steps.vars.outputs.sha }}
+          path: ${{ steps.vars.outputs.bin }}
           if-no-files-found: error