fix: ADDON-67588 internal repo installation (#215)

Fix for reported
[ADDON-67588](https://splunk.atlassian.net/browse/ADDON-67588) problem
with installation of internal repositories.
In `reusable-build-test-release.yml` GH_TOKEN_ADMIN is used for
authentication against https://github.com
In `test-addon.sh` GITHUB_USERNAME and GITHUB_PASSWORD are used for
authentication against https://github.com

Related PR:
splunk/ta-automation-k8s-manifests#75

Tested on:

https://github.com/splunk/splunk-add-on-for-microsoft-cloud-services/actions/runs/7468842506/job/20340167700

.github/workflows/reusable-build-test-release.yml

@@ -443,6 +443,7 @@ jobs:
              poetry export --without-hashes --dev -o requirements_dev.txt
            fi
           if [ ! -f requirements_dev.txt ]; then echo no requirements;exit 0 ;fi
+          git config --global url."https://${{ secrets.GH_TOKEN_ADMIN }}@github.com".insteadOf https://github.com
           pip install -r requirements_dev.txt
       - name: Create directories
         run: |
@@ -491,6 +492,7 @@ jobs:
              poetry export --without-hashes --dev -o requirements_dev.txt
            fi
           if [ ! -f requirements_dev.txt ]; then echo no requirements;exit 0 ;fi
+          git config --global url."https://${{ secrets.GH_TOKEN_ADMIN }}@github.com".insteadOf https://github.com
           pip install -r requirements_dev.txt
       - name: Create directories
         run: |
@@ -571,7 +573,9 @@ jobs:
             ${{ runner.os }}-pip-
       - name: Install deps
         if: ${{ steps.checklibs.outputs.ENABLED == 'true' }}
-        run: pip install -r requirements_dev.txt
+        run: |
+          git config --global url."https://${{ secrets.GH_TOKEN_ADMIN }}@github.com".insteadOf https://github.com
+          pip install -r requirements_dev.txt
       - name: Semantic Release Get Next
         id: semantic
         if: github.event_name != 'pull_request'
@@ -701,7 +705,9 @@ jobs:
           key: ${{ runner.os }}-pip-python3_9-${{ hashFiles('requirements_dev.txt') }}
           restore-keys: |
             ${{ runner.os }}-pip-python3_9
-      - run: pip install -r requirements_dev.txt
+      - run: |
+          git config --global url."https://${{ secrets.GH_TOKEN_ADMIN }}@github.com".insteadOf https://github.com
+          pip install -r requirements_dev.txt
       - id: semantic
         if: github.event_name != 'pull_request'
         uses: splunk/[email protected]