removed travis, use github action

.github/workflows/main.yml

@@ -0,0 +1,56 @@
+on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest-16-cores
+    steps:
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Log into Docker Hub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Build for linux/amd64
+        uses: docker/build-push-action@v3
+        with:
+          build-args: |
+            VCS_REF=${{ github.sha }}
+          load: true
+          platforms: linux/amd64
+          tags: cs50/mysql:amd64
+          cache-from: type=registry,ref=cs50/mysql:amd64-buildcache
+          cache-to: type=registry,ref=cs50/mysql:amd64-buildcache,mode=max
+
+      - name: Push linux/amd64 build to Docker Hub
+        if: ${{ github.ref == 'refs/heads/main' }}
+        run: |
+          docker push cs50/mysql:amd64
+
+      - name: Build for linux/arm64
+        uses: docker/build-push-action@v3
+        with:
+          build-args: |
+            VCS_REF=${{ github.sha }}
+          load: true
+          platforms: linux/arm64
+          tags: cs50/mysql:arm64
+          cache-from: type=registry,ref=cs50/mysql:arm64-buildcache
+          cache-to: type=registry,ref=cs50/mysql:arm64-buildcache,mode=max
+
+      - name: Push linux/arm64 build to Docker Hub
+        if: ${{ github.ref == 'refs/heads/main' }}
+        run: |
+          docker push cs50/mysql:arm64
+
+      - name: Create multi-arch manifest and push to Docker Hub
+        if: ${{ github.ref == 'refs/heads/main' }}
+        run: |
+          docker manifest create cs50/mysql:latest \
+          --amend cs50/mysql:amd64 \
+          --amend cs50/mysql:arm64
+          docker manifest push cs50/mysql:latest