fix: Dockerfile to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-UBUNTU2004-BASH-581100
- https://snyk.io/vuln/SNYK-UBUNTU2004-GNUTLS28-1085477
- https://snyk.io/vuln/SNYK-UBUNTU2004-GNUTLS28-1085499
- https://snyk.io/vuln/SNYK-UBUNTU2004-SYSTEMD-582552
- https://snyk.io/vuln/SNYK-UBUNTU2004-SYSTEMD-582552

CHANGELOG.md

@@ -1,20 +1,3 @@
-<a name="v1.2.0"></a>
-## v1.2.0
-
-### Ci
-- breakout docker build for merge only
-
-### Feat
-- update RPC version to 1.2.0.
-- BREAKING CHANGE: add heartbeat capability, bump RPC Protocol version to 4.0.0
-- add unit test framework
-- add hostname to activation info
-- **docker:** add dockerfile support for RPC
-
-### Fix
-- use message status instead, cleanup message fields.
-
-
 <a name="v1.1.0"></a>
 ## [v1.1.0] - 2021-02-09
 

Dockerfile

@@ -3,7 +3,7 @@
 # SPDX-License-Identifier: Apache-2.0
 #*********************************************************************/
 
-FROM ubuntu:20.04 AS rpc-builder
+FROM ubuntu:20.10 AS rpc-builder
 
 WORKDIR /
 ARG DEBIAN_FRONTEND=noninteractive
@@ -23,7 +23,7 @@ WORKDIR /rpc/build
 RUN cmake -DCMAKE_BUILD_TYPE=Debug -DCMAKE_TOOLCHAIN_FILE=/rpc/vcpkg/scripts/buildsystems/vcpkg.cmake ..
 RUN cmake --build .
 
-FROM ubuntu:20.04 
+FROM ubuntu:20.10 
 
 LABEL license='SPDX-License-Identifier: Apache-2.0' \
       copyright='Copyright (c) 2021: Intel'