Enhance support for multi-tenancy (#1371)

This enhances every ARC controller and the various K8s custom resources so that the user can now configure a custom GitHub API credentials (that is different from the default one configured per the ARC instance).

Ref https://github.com/actions-runner-controller/actions-runner-controller/issues/1067#issuecomment-1043716646

config/crd/bases/actions.summerwind.dev_horizontalrunnerautoscalers.yaml

@@ -61,6 +61,16 @@ spec:
                         type: integer
                     type: object
                   type: array
+                githubAPICredentialsFrom:
+                  properties:
+                    secretRef:
+                      properties:
+                        name:
+                          type: string
+                      required:
+                        - name
+                      type: object
+                  type: object
                 maxReplicas:
                   description: MaxReplicas is the maximum number of replicas the deployment is allowed to scale
                   type: integer

config/crd/bases/actions.summerwind.dev_runnerdeployments.yaml

@@ -2415,6 +2415,16 @@ spec:
                               - name
                             type: object
                           type: array
+                        githubAPICredentialsFrom:
+                          properties:
+                            secretRef:
+                              properties:
+                                name:
+                                  type: string
+                              required:
+                                - name
+                              type: object
+                          type: object
                         group:
                           type: string
                         hostAliases:

config/crd/bases/actions.summerwind.dev_runnerreplicasets.yaml

@@ -2412,6 +2412,16 @@ spec:
                               - name
                             type: object
                           type: array
+                        githubAPICredentialsFrom:
+                          properties:
+                            secretRef:
+                              properties:
+                                name:
+                                  type: string
+                              required:
+                                - name
+                              type: object
+                          type: object
                         group:
                           type: string
                         hostAliases:

config/crd/bases/actions.summerwind.dev_runners.yaml

@@ -2356,6 +2356,16 @@ spec:
                       - name
                     type: object
                   type: array
+                githubAPICredentialsFrom:
+                  properties:
+                    secretRef:
+                      properties:
+                        name:
+                          type: string
+                      required:
+                        - name
+                      type: object
+                  type: object
                 group:
                   type: string
                 hostAliases:

config/crd/bases/actions.summerwind.dev_runnersets.yaml

@@ -67,6 +67,16 @@ spec:
                   type: string
                 ephemeral:
                   type: boolean
+                githubAPICredentialsFrom:
+                  properties:
+                    secretRef:
+                      properties:
+                        name:
+                          type: string
+                      required:
+                        - name
+                      type: object
+                  type: object
                 group:
                   type: string
                 image: