fix: Dockerfile to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-UBUNTU2204-DPKG-2847996
- https://snyk.io/vuln/SNYK-UBUNTU2204-E2FSPROGS-2801319
- https://snyk.io/vuln/SNYK-UBUNTU2204-OPENSSL-2807615
- https://snyk.io/vuln/SNYK-UBUNTU2204-OPENSSL-2807639
- https://snyk.io/vuln/SNYK-UBUNTU2204-PERL-2789081

Dockerfile

@@ -5,7 +5,7 @@
 
 
 # Set the base image to Ubuntu
-FROM ubuntu
+FROM ubuntu:22.04
 
 # File Author / Maintainer
 MAINTAINER Karthik Gaekwad