add reposHostMapping key (#704)

## What
<!-- What is changing in this PR? -->

## Why
<!-- Why are these changes being made? -->

## Notes
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Makefile

@@ -1,4 +1,4 @@
-VERSION=v0.1.49
+VERSION=v0.1.50
 
 OUT_DIR=dist
 YEAR?=$(shell date +"%Y")

manifests/app-proxy/app-proxy.deploy.yaml

@@ -95,6 +95,12 @@ spec:
                   name: cap-app-proxy-cm
                   key: reposDir
                   optional: true
+            - name: REPOS_HOST_MAPPING
+              valueFrom:
+                configMapKeyRef:
+                  name: cap-app-proxy-cm
+                  key: reposHostMapping
+                  optional: true
             - name: RUNTIME_NAME
               valueFrom:
                 configMapKeyRef: