ci: Fix installation of kubectl and helm

.forgejo/workflows/deploy.yaml

@@ -26,8 +26,17 @@ jobs:
     container: catthehacker/ubuntu:act-latest
     steps:
     - name: Checkout
-      uses: actions/checkout@v4
-    - run: apt update && apt install kubectl helm
+      run: actions/checkout@v4
+    - name: Install kubectl
+      run: |
+        curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl"
+        mv kubectl /usr/bin/kubectl
+    - name: Install helm
+      run: |
+        cd /tmp
+        curl -L "https://get.helm.sh/helm-v3.18.0-rc.2-linux-amd64.tar.gz"  -o helm.tgz
+        tar xf helm.tgz
+        helm liux-amd64/helm /usr/bin/helm
     - name: Setup k8s context
       run: |
         echo "${{secrets.KUBE_API_CRT}}" > /tmp/ca.pem