CH-122 fix stage template

[filippomc]

Closes CH-122

Implemented solution: fixed deployment-configuration template mistake

How to test this PR: create a staging deployment and run on codefresh

Sanity checks:

• [x] The pull request is explicitly linked to the relevant issue(s)
• [x] The issue is well described: clearly states the problem and the general proposed solution(s)
• [x] From the issue and the current PR it is explicitly stated how to test the current change
• [x] The labels in the issue set the scope and the type of issue (bug, feature, etc.)
• [ ] All the automated test checks are passing
• [ ] All the linked issues are included in one milestone
• [ ] All the linked issues are in the Review/QA column of the board
• [ ] All the linked issues are assigned

Breaking changes (select one):

• [ ] The present changes do not change the preexisting api in any way
• [ ] This PR and the issue are tagged as a breaking-change

Possible deployment updates issues (select one):

• [ ] There is no reason why deployments based on CloudHarness may break after the current update
• [ ] This PR and the issue are tagged as alert:deployment

Test coverage (select one):

• [ ] Tests for the relevant cases are included in this pr
• [ ] The changes included in this pr are out of the current test coverage scope

Documentation (select one):

• [ ] The documentation has been updated to match the current changes
• [ ] The changes included in this PR are out of the current documentation scope

Nice to have (if relevant):

• [ ] Screenshots of the changes
• [ ] Explanatory video/animated gif