Revert "Commit to reverse before PR"

This reverts commit f2fa6d69ca.

.github/workflows/main.yml

@@ -14,8 +14,34 @@ on:
   workflow_dispatch:
 
 jobs:
+  base:
+    name: base
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: build
+        run: make base
+      - name: test
+        run: make base.test
+      - name: archive base
+        run: |
+          mkdir -p cache
+          docker save dockcross/base:latest | xz -e9 -T0 > ./cache/base.tar.xz
+      - name: save base
+        uses: actions/upload-artifact@v2
+        with:
+          name: cache
+          path: ./cache
+          retention-days: 1
+      - name: deploy
+        if: github.ref == 'refs/heads/master'
+        run: |
+          docker login -u ${{ secrets.DOCKER_USER }} -p ${{ secrets.DOCKER_PASS }}
+          docker image push dockcross/base --all-tags
+
   image:
     name: ${{ matrix.arch_name.image }}
+    needs: base
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
@@ -392,6 +418,16 @@ jobs:
             }
     steps:
       - uses: actions/checkout@v2
+      - uses: actions/download-artifact@v2
+        with:
+          name: cache
+          path: ./cache
+      - name: load base
+        run: xz -d -k < ./cache/base.tar.xz | docker load
+      - name: build
+        run: make ${{ matrix.arch_name.image }}
+      - name: basic test
+        run: make ${{ matrix.arch_name.image }}.test
       - name: stockfish build test
         if: ${{ matrix.arch_name.stockfish == 'yes' }}
         run: |