Rename GHA's main job to CI (#5617)

This commit renames the `main` job in GHA workflows to `CI`.

Signed-off-by: Jesús Benito Calzada <bjesus@vmware.com>

Author: Jesús Miguel Benito Calzada

.github/workflows/kubeapps-full-integration.yaml

@@ -12,7 +12,7 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
-  main:
+  CI:
     uses: ./.github/workflows/kubeapps-general.yaml
     secrets: inherit
     with:

.github/workflows/kubeapps-main.yaml

@@ -15,6 +15,6 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
-  main:
+  CI:
     uses: ./.github/workflows/kubeapps-general.yaml
     secrets: inherit

.github/workflows/kubeapps-release.yml

@@ -14,7 +14,7 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
-  main:
+  CI:
     uses: ./.github/workflows/kubeapps-general.yaml
     secrets: inherit
     with: