fix: install helm via binary download, drop apt

helm-package-push/action.yml

@@ -24,13 +24,9 @@ runs:
     - name: Install Helm
       shell: bash
       run: |
-        curl -fsSL https://packages.buildkite.com/helm-linux/helm-debian/gpgkey \
-          | gpg --dearmor \
-          | sudo tee /usr/share/keyrings/helm.gpg > /dev/null
-        echo "deb [signed-by=/usr/share/keyrings/helm.gpg] https://packages.buildkite.com/helm-linux/helm-debian/any/ any main" \
-          | sudo tee /etc/apt/sources.list.d/helm-stable-debian.list
-        sudo apt-get update -qq
-        sudo apt-get install -y helm
+        curl -fsSL https://get.helm.sh/helm-v3.14.4-linux-amd64.tar.gz \
+          | tar xz -C /tmp
+        mv /tmp/linux-amd64/helm /usr/local/bin/helm
         helm version --short
 
     - name: Inject image tag into chart values