doc(doc/dev/developer_guide): adding steps over how to test the changes made locally (#2650)

Author: camilamacedo86

doc/dev/developer_guide.md

@@ -9,6 +9,7 @@ This document explains how to setup your dev environment.
 ## Download Operator SDK
 
 Go to the [Operator SDK repo][repo-sdk] and follow the [fork guide][fork-guide] to fork, clone, and setup the local operator-sdk repository.
+
 ## Build the Operator SDK CLI
 
 Build the Operator SDK CLI `operator-sdk` binary:
@@ -17,6 +18,8 @@ Build the Operator SDK CLI `operator-sdk` binary:
 $ make install
 ```
 
+Then, now you are able to test and use the operator-sdk build using the source code.
+
 ## Testing
 
 The SDK includes many tests that are run as part of CI.
@@ -36,6 +39,79 @@ $ make test
 For more information on running testing and correctly configuring your environment,
 refer to the [`Running the Tests Locally`][running-the-tests] document.
 
+To run the lint checks done in the CI locally, run:
+
+```sh
+$ make lint
+```
+
+**NOTE** Note that for it is required to install `golangci-lint` locally. For more info see its [doc](https://github.com/golangci/golangci-lint#install)
+
+## How to test the changes done for Ansible/Helm based-operator projects?
+
+If the change performed is NOT in the scaffold files or sdk commands then, is required to build an new image with the changes done to test it locally. In this way, by using this dev image in an operator project locally we will be able to check the changes made for the Ansible/Helm based-operator. 
+
+### For Ansible
+
+- Update the `ANSIBLE_BASE_IMAGE` var in the [Makefile][makefile] to generate an image for your repository (quay.io or docker.hub.io). See:
+
+Replace:
+  
+```
+quay.io/operator-framework/ansible-operator
+```
+
+With (eg):
+
+```
+quay.io/my-repo-user/ansible-operator
+```
+
+- Build the image locally by running `make image-build-ansible`
+- Push your new image. (E.g `docker push quay.io/my-repo-user/ansible-operator:dev`)
+
+**NOTE** Ensure that you configured the repo, `quay.io/my-repo-user/ansible-operator`, to be public.
+
+- Update the `Dockerfile` of your POC project to test your changes with the new image as follows. 
+
+```
+FROM quay.io/my-repo-user/ansible-operator:dev
+
+COPY watches.yaml ${HOME}/watches.yaml
+COPY roles/ ${HOME}/roles/
+```  
+
+### For Helm
+
+
+- Update the `HELM_BASE_IMAGE` var in the [Makefile][makefile] to generate an image for your repository (quay.io or docker.hub.io). See:
+
+Replace:
+  
+```
+quay.io/operator-framework/helm-operator
+```
+
+With (eg):
+
+```
+quay.io/my-repo-user/helm-operator
+```
+
+- Build the image locally by running `make image-build-helm`
+- Push your new image. (E.g `docker push quay.io/my-repo-user/helm-operator:dev`)
+
+**NOTE** Ensure that you configured the repo, `quay.io/my-repo-user/helm-operator`, to be public.
+
+- Update the `Dockerfile` of your POC project to test your changes with the new image as follows. 
+
+```
+FROM quay.io/my-repo-user/helm-operator:dev
+
+COPY watches.yaml ${HOME}/watches.yaml
+COPY helm-charts/ ${HOME}/helm-charts/
+```  
+
 See the project [README][sdk-readme] for more details.
 
 [git-tool]:https://git-scm.com/downloads
@@ -46,3 +122,4 @@ See the project [README][sdk-readme] for more details.
 [kubectl-tool]:https://kubernetes.io/docs/tasks/tools/install-kubectl/
 [sdk-readme]:../../README.md
 [running-the-tests]: ./testing/running-the-tests.md
+[makefile]:../../Makefile