Add composite action

action.yml

@@ -0,0 +1,35 @@
+name: "Kubectl/Tailscale for Paltiverse"
+description: "Connect to kube-api through a Tailscale tunnel and set up kubectl"
+inputs:
+  tailscale-token:
+    description: "An authKey for connecting to Tailscale"
+    required: true
+  k8s-config:
+    description: "A kubeconfig file for authenticating with the kube-api"
+    required: true
+outputs:
+  k8s-config-path:
+    description: "The location of the stored kubeconfig file. You can use this through the KUBECONFIG variable to kubectl calls."
+    value: /opt/kube/config
+runs:
+  using: composite
+  steps:
+    - run: apk add tailscale kubectl bash curl
+      name: Install dependencies
+      shell: bash
+    - name: Create kube directory
+      run: mkdir /opt/kube
+      shell: bash
+    - name: Bootstrap kubeconfig
+      run: echo "$PALTIVERSE_K8S" | base64 -d > /opt/kube/config
+      env:
+        PALTIVERSE_K8S: ${{ inputs.k8s-config }}
+      shell: bash
+    - name: Add tailscale proxy to kubeconfig
+      run: kubectl config set clusters.default.proxy-url http://localhost:1055
+      env:
+        KUBECONFIG: /opt/kube/config
+      shell: bash
+    - name: Configure tailscale
+      run: tailscaled --tun=userspace-networking --socks5-server=localhost:1055 --outbound-http-proxy-listen=localhost:1055 & tailscale up --authkey="${{ secrets.TAILSCALE_TOKEN }}" --advertise-tags=tag:gitea-runners
+      shell: bash