Use sh for shell

action.yml

@@ -16,20 +16,20 @@ runs:
   steps:
     - run: apk add tailscale kubectl bash curl
       name: Install dependencies
-      shell: bash
+      shell: sh
     - name: Create kube directory
       run: mkdir /opt/kube
-      shell: bash
+      shell: sh
     - name: Bootstrap kubeconfig
       run: echo "$PALTIVERSE_K8S" | base64 -d > /opt/kube/config
       env:
         PALTIVERSE_K8S: ${{ inputs.k8s-config }}
-      shell: bash
+      shell: sh
     - name: Add tailscale proxy to kubeconfig
       run: kubectl config set clusters.default.proxy-url http://localhost:1055
       env:
         KUBECONFIG: /opt/kube/config
-      shell: bash
+      shell: sh
     - name: Configure tailscale
       run: tailscaled --tun=userspace-networking --socks5-server=localhost:1055 --outbound-http-proxy-listen=localhost:1055 & tailscale up --authkey="${{ secrets.TAILSCALE_TOKEN }}" --advertise-tags=tag:gitea-runners
-      shell: bash
+      shell: sh