Updated 7.9 image base to Ubuntu 22.04 (#147)

* Updated 7.9 image base to Ubuntu 22.04
* Moved base image def to buildx bake file

Author: thirdgen88

7.9/Dockerfile

@@ -100,7 +100,7 @@ RUN set -exo pipefail; \
     fi
 
 # RUNTIME IMAGE
-FROM eclipse-temurin:8-jre-focal as final
+FROM jre-base as final
 LABEL maintainer "Kevin Collins <kcollins@purelinux.net>"
 
 # Install some prerequisite packages

docker-bake.hcl

@@ -25,6 +25,9 @@ variable "IGNITION_VERSION_81_RC" {
 # Ignition Base Build Targets
 target "7_9-base" {
     context = "7.9"
+    contexts = {
+        jre-base = "docker-image://eclipse-temurin:8-jre-jammy"
+    }
     platforms = [
         "linux/amd64",
         "linux/arm",