Allow {web_,task_,}replicas to be 0 and split out molecule tests (#1468)

Signed-off-by: Rick Elrod <rick@elrod.me>

.github/workflows/ci.yaml

@@ -4,15 +4,17 @@ name: CI
 
 on:
   pull_request:
-    branches: [devel]
-
   push:
-    branches: [devel]
 
 jobs:
   molecule:
     runs-on: ubuntu-latest
     name: molecule
+    strategy:
+      matrix:
+        ansible_args:
+          - --skip-tags=replicas
+          - -t replicas
     env:
       DOCKER_API_VERSION: "1.41"
     steps:
@@ -38,7 +40,7 @@ jobs:
         run: |
           sudo rm -f $(which kustomize)
           make kustomize
-          KUSTOMIZE_PATH=$(readlink -f bin/kustomize) molecule test -s kind
+          KUSTOMIZE_PATH=$(readlink -f bin/kustomize) molecule test -s kind -- ${{ matrix.ansible_args }}
   helm:
     runs-on: ubuntu-latest
     name: helm