fixes broken "make run" for ansible operators

Previously, an ansible operator would be scaffolded with a Makefile
whose "run" target had incorrect syntax. It would run this command:

`ANSIBLE_ROLES_PATH="$(ANSIBLE_ROLES_PATH):$(shell pwd)/roles" $(ANSIBLE_OPERATOR) run`

That command failed to set the `ANSIBLE_ROLES_PATH` variable correctly
because it was using Makefile syntax in a target's recipe, which gets
interpreted as shell script.

This commit moves the variable setting statement, which uses Makefile
syntax, out of the recipe. It also uses the standard `?=` operator to
only set the variable if it is unset.

Signed-off-by: Michael Hrivnak <mhrivnak@redhat.com>

changelog/fragments/01-ansible-fix-make-run.yaml

@@ -0,0 +1,40 @@
+# entries is a list of entries to include in
+# release notes and/or the migration guide
+entries:
+  - description: 'ansible: fixed "make run" so it finds local roles'
+
+    # kind is one of:
+    # - addition
+    # - change
+    # - deprecation
+    # - removal
+    # - bugfix
+    kind: "bugfix"
+
+    # Is this a breaking change?
+    breaking: false
+
+    # NOTE: ONLY USE `pull_request_override` WHEN ADDING THIS
+    # FILE FOR A PREVIOUSLY MERGED PULL_REQUEST!
+    #
+    # The generator auto-detects the PR number from the commit
+    # message in which this file was originally added.
+    #
+    # What is the pull request number (without the "#")?
+    # pull_request_override: 0
+
+
+    # Migration can be defined to automatically add a section to
+    # the migration guide. This is required for breaking changes.
+    migration:
+      header: update ansible operator Makefile's run target
+      body: |
+        For an ansible operator, update the Makefile's run target to the
+        following to fix a bug in its implementation.
+
+        ```
+        .PHONY: run
+        ANSIBLE_ROLES_PATH?="$(shell pwd)/roles"
+        run: ansible-operator ## Run against the configured Kubernetes cluster in ~/.kube/config
+            $(ANSIBLE_OPERATOR) run
+        ```

internal/plugins/ansible/v1/scaffolds/internal/templates/makefile.go

@@ -91,8 +91,9 @@ help: ## Display this help.
 ##@ Build
 
 .PHONY: run
+ANSIBLE_ROLES_PATH?="$(shell pwd)/roles"
 run: ansible-operator ## Run against the configured Kubernetes cluster in ~/.kube/config
-	ANSIBLE_ROLES_PATH="$(ANSIBLE_ROLES_PATH):$(shell pwd)/roles" $(ANSIBLE_OPERATOR) run
+	$(ANSIBLE_OPERATOR) run
 
 .PHONY: docker-build
 docker-build: ## Build docker image with the manager.