Replace jkroepke/setup-stackit-cli

Author: jkroepke

.github/workflows/ci.yaml

@@ -18,7 +18,14 @@ jobs:
         with:
           go-version: ${{ matrix.go-version }}
       - name: Install STACKIT CLI
-        uses: jkroepke/setup-stackit-cli@v1
+        run: >-
+          OS=$(uname | tr '[:upper:]' '[:lower:]')
+          ARCH=$(uname -m)
+          
+          [ "$ARCH" = "x86_64" ] && ARCH=amd64
+          [ "$ARCH" = "aarch64" ] && ARCH=amd64
+          
+          curl -sSfLo - https://github.com/stackitcloud/stackit-cli/releases/download/v0.31.0/stackit-cli_0.31.0_${OS}_${ARCH}.tar.gz | sudo tar zxvf - -C /usr/local/bin/ stackit
       - name: Test
         run: make test