Switch to ssh key for private requirements_git (#15838)

.github/workflows/devel_images.yml

@@ -3,7 +3,6 @@ name: Build/Push Development Images
 env:
   LC_ALL: "C.UTF-8" # prevent ERROR: Ansible could not initialize the preferred locale: unsupported locale setting
   DOCKER_CACHE: "--no-cache" # using the cache will not rebuild git requirements and other things
-  CI_PRIVATE_GITHUB_TOKEN: ${{ secrets.PRIVATE_GITHUB_TOKEN }}
 on:
   workflow_dispatch:
   push:
@@ -74,10 +73,25 @@ jobs:
           make ui
         if: matrix.build-targets.image-name == 'awx'
 
-      - name: Add private GitHub token to requirements_git.credentials.txt
+      - name: Generate placeholder SSH private key if SSH auth for private repos is not needed
+        id: generate_key
         shell: bash
-        run: echo "https://x-access-token:${{ secrets.PRIVATE_GITHUB_TOKEN }}@github.com" >> requirements/requirements_git.credentials.txt
-        if: ${{ env.CI_PRIVATE_GITHUB_TOKEN != '' }}
+        run: |
+          if [[ -z "${{ secrets.PRIVATE_GITHUB_KEY }}" ]]; then
+            ssh-keygen -t ed25519 -C "github-actions" -N "" -f ~/.ssh/id_ed25519
+            echo "SSH_PRIVATE_KEY<<EOF" >> $GITHUB_OUTPUT
+            cat ~/.ssh/id_ed25519 >> $GITHUB_OUTPUT
+            echo "EOF" >> $GITHUB_OUTPUT
+          else
+            echo "SSH_PRIVATE_KEY<<EOF" >> $GITHUB_OUTPUT
+            echo "${{ secrets.PRIVATE_GITHUB_KEY }}" >> $GITHUB_OUTPUT
+            echo "EOF" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Add private GitHub key to SSH agent
+        uses: webfactory/ssh-agent@v0.9.0
+        with:
+          ssh-private-key: ${{ steps.generate_key.outputs.SSH_PRIVATE_KEY }}
 
       - name: Build and push AWX devel images
         run: |