Merge pull request #5931 from tao12345666333/update-to-alpine-3.10

ref(rootfs):update to alpine 3.10

rootfs/Dockerfile

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM alpine:3.9
+FROM alpine:3.10
 
 RUN apk add --no-cache ca-certificates socat
 

rootfs/Dockerfile.experimental

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM alpine:3.9
+FROM alpine:3.10
 
 RUN apk add --no-cache ca-certificates
 

rootfs/Dockerfile.rudder

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM alpine:3.9
+FROM alpine:3.10
 
 RUN apk add --no-cache ca-certificates