ci: Make codecov steps conditional on codecov secret existence and enable running them on forks (#25765)

Signed-off-by: reggie-k <regina.voloshin@codefresh.io>

.github/workflows/ci-build.yaml

@@ -357,6 +357,7 @@ jobs:
       - test-e2e
     env:
       sonar_secret: ${{ secrets.SONAR_TOKEN }}
+      codecov_secret: ${{ secrets.CODECOV_TOKEN }}
     steps:
       - name: Checkout code
         uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
@@ -368,19 +369,23 @@ jobs:
         with:
           path: ui/node_modules
           key: ${{ runner.os }}-node-dep-v2-${{ hashFiles('**/yarn.lock') }}
+        if: env.codecov_secret != ''
       - name: Remove other node_modules directory
         run: |
           rm -rf ui/node_modules/argo-ui/node_modules
+        if: env.codecov_secret != ''
       - name: Get e2e code coverage
         uses: actions/download-artifact@37930b1c2abaa49bbe596cd826c3c89aef350131 # v7.0.0
         with:
           name: e2e-code-coverage
           path: e2e-code-coverage
+        if: env.codecov_secret != ''
       - name: Get unit test code coverage
         uses: actions/download-artifact@37930b1c2abaa49bbe596cd826c3c89aef350131 # v7.0.0
         with:
           name: test-results
           path: test-results
+        if: env.codecov_secret != ''
       - name: combine-go-coverage
         # We generate coverage reports for all Argo CD components, but only the applicationset-controller,
         # app-controller, repo-server, and commit-server report contain coverage data. The other components currently
@@ -388,6 +393,7 @@ jobs:
         # references to their coverage output directories.
         run: |
           go tool covdata percent -i=test-results,e2e-code-coverage/applicationset-controller,e2e-code-coverage/repo-server,e2e-code-coverage/app-controller,e2e-code-coverage/commit-server -o test-results/full-coverage.out
+        if: env.codecov_secret != ''
       - name: Upload code coverage information to codecov.io
         uses: codecov/codecov-action@671740ac38dd9b0130fbe1cec585b89eea48d3de # v5.5.2
         with:
@@ -395,8 +401,10 @@ jobs:
           fail_ci_if_error: true
         env:
           CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+        if: env.codecov_secret != ''
       - name: Upload test results to Codecov
-        if: github.ref == 'refs/heads/master' && github.event_name == 'push' && github.repository == 'argoproj/argo-cd'
+        # Codecov uploads test results to Codecov.io on upstream master branch and on fork master branch if the token is configured.
+        if: env.codecov_secret != '' && github.ref == 'refs/heads/master' && github.event_name == 'push'
         uses: codecov/codecov-action@671740ac38dd9b0130fbe1cec585b89eea48d3de # v5.5.2
         with:
           files: test-results/junit.xml