Update vmpooler chart to accept image tag override

Prior to this, the only way to set the image tag was by modifying the
appVersion param of the chart itself. This made it impossible to use a
non-default image version.

docs/index.yaml

@@ -3,7 +3,22 @@ entries:
   vmpooler:
   - apiVersion: v2
     appVersion: 1.0.0-prod-all-providers
-    created: "2021-12-09T11:59:49.029819707-05:00"
+    created: "2021-12-13T12:57:32.31814774-05:00"
+    dependencies:
+    - name: redis
+      repository: https://charts.bitnami.com/bitnami
+      version: 10.7.12
+    description: A Helm chart to deploy vmpooler
+    digest: cc06f56e3cd6d2135c6d15da83b750a445e4856e2b366af0a1713be47eccedb4
+    icon: https://github.com/puppetlabs/vmpooler/raw/master/lib/vmpooler/public/img/logo.png
+    name: vmpooler
+    type: application
+    urls:
+    - https://puppetlabs.github.io/vmpooler-deployment/vmpooler-1.7.1.tgz
+    version: 1.7.1
+  - apiVersion: v2
+    appVersion: 1.0.0-prod-all-providers
+    created: "2021-12-13T12:57:32.315394959-05:00"
     dependencies:
     - name: redis
       repository: https://charts.bitnami.com/bitnami
@@ -18,7 +33,7 @@ entries:
     version: 1.7.0
   - apiVersion: v2
     appVersion: 1.3.0
-    created: "2021-12-09T11:59:49.022301197-05:00"
+    created: "2021-12-13T12:57:32.312208652-05:00"
     dependencies:
     - name: redis
       repository: https://charts.bitnami.com/bitnami
@@ -33,7 +48,7 @@ entries:
     version: 1.6.3
   - apiVersion: v2
     appVersion: 1.3.0
-    created: "2021-12-09T11:59:49.009848522-05:00"
+    created: "2021-12-13T12:57:32.308927559-05:00"
     dependencies:
     - name: redis
       repository: https://charts.bitnami.com/bitnami
@@ -48,7 +63,7 @@ entries:
     version: 1.6.2
   - apiVersion: v2
     appVersion: 1.3.0
-    created: "2021-12-09T11:59:49.001801711-05:00"
+    created: "2021-12-13T12:57:32.306210785-05:00"
     dependencies:
     - name: redis
       repository: https://charts.bitnami.com/bitnami
@@ -63,7 +78,7 @@ entries:
     version: 1.6.1
   - apiVersion: v2
     appVersion: 1.3.0
-    created: "2021-12-09T11:59:48.99054428-05:00"
+    created: "2021-12-13T12:57:32.302874489-05:00"
     dependencies:
     - name: redis
       repository: https://charts.bitnami.com/bitnami
@@ -76,4 +91,4 @@ entries:
     urls:
     - https://puppetlabs.github.io/vmpooler-deployment/vmpooler-1.6.0.tgz
     version: 1.6.0
-generated: "2021-12-09T11:59:48.97218007-05:00"
+generated: "2021-12-13T12:57:32.298620936-05:00"