CI: Fix docker release builds

Because the docker images we use to build are now too old to run
the marketplace actions themselves, we have to run these outside
of docker and then docker exec to do the build process.

.github/workflows/release-docker-binaries.yml

@@ -35,16 +35,17 @@ jobs:
         with:
           ref: ${{ github.ref }}
 
-      - name: Get ANTs version
+      - name: Get ANTs version and set artifact name
         run: |
           echo "ANTS_VERSION=${ANTS_TAG#v}" >> $GITHUB_ENV
+          echo "ARTIFACT=ants-${ANTS_TAG}-${{ matrix.config.os }}-${{ runner.arch }}-${{ matrix.config.cc }}.zip" >> $GITHUB_ENV
         env:
           ANTS_TAG: ${{ github.ref_name }}
 
       - name: Set up build container
         run: |
           docker pull ${{ matrix.config.image }}
-          docker create --name build_container -v ${{ github.workspace }}:/workspace ${{ matrix.config.image }} sleep infinity
+          docker create --name build_container -v ${{ github.workspace }}:/workspace -v ${{ runner.temp }}/artifact:/artifact ${{ matrix.config.image }} sleep infinity
           docker start build_container
       - name: Install dependencies on Centos
         if: startsWith(matrix.config.name, 'Centos7')
@@ -116,15 +117,15 @@ jobs:
         run: |
           docker exec --user root build_container bash -c "
             cd /workspace/install
-            zip -r /workspace/${{ env.ARTIFACT }} .
+            zip -r /artifact/${{ env.ARTIFACT }} .
           "
       - name: Upload release asset
         uses: ncipollo/release-action@v1.14.0
         with:
           allowUpdates: true
           omitBodyDuringUpdate: true
           omitNameDuringUpdate: true
-          artifacts: "${{ env.ARTIFACT }}"
+          artifacts: "${{ runner.temp }}/artifact/${{ env.ARTIFACT }}"
           artifactContentType: application/zip
           token: ${{ secrets.GITHUB_TOKEN }}