Add temporary deploy key in order to fetch the private modules.

This is a temporary workaround for golang.

Signed-off-by: Alexander Dahmen <alexander.dahmen@inovex.de>

Author: Fyusel

.github/workflows/ci.yaml

@@ -25,6 +25,16 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v5
+      # TODO: remove when this repo is made public
+      - uses: webfactory/ssh-agent@v0.6.0
+        with:
+          ssh-private-key: |
+            ${{ secrets.TEMP_DEPLOY_KEY }}
+      - name: Configure Git for Private Modules
+        run: |
+          go env -w GOPRIVATE="github.com/stackitcloud/pulumi-stackit"
+          git config --global url."ssh://git@github.com/".insteadOf "https://github.com/"
+      # TODO: remove end
       - name: Unshallow clone for tags
         run: git fetch --prune --unshallow --tags
       - name: Install pulumictl