Issue 4170: Update base JRE image to 8u212-jre-alpine3.9 (#4279)
Issue 4170: Update base JRE image to 8u212-jre-alpine3.9 (#4279)

Signed-off-by: Prabhaker Saxena <0b3917268783d6369b2f92a1ab5172c9d9f86338@dell.com>
pravega/pravega,pravega/pravega,pravega/pravega