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README.md

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+## Act Runner Installer
+
+Simple installer to fetch and install the latest `gitea/act_runner` release for your Linux machine.
+
+### Quick start
+
+Run the installer directly:
+
+```bash
+curl -fSSL https://<url>/install.sh | bash
+```
+
+If your environment requires elevated permissions to write to `/usr/local/bin`, run with sudo:
+
+```bash
+curl -fSSL https://<url>/install.sh | sudo bash
+```
+
+### What it does
+
+- Detects your CPU architecture
+- Fetches the latest `act_runner` release info
+- Downloads the appropriate Linux binary
+- Installs it to `/usr/local/bin/act_runner` and makes it executable
+
+### Requirements
+
+- Linux
+- `curl`, `jq`, `wget`, `unxz`, `sha256sum`
+
+### Notes
+
+- The script will update an existing installation if a newer version is available.
+- You may need network access to `gitea.com` to retrieve release metadata.
+
+### Uninstall
+
+```bash
+sudo rm -f /usr/local/bin/act_runner
+```

install.sh

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+#!/bin/bash
+
+check_command() {
+    command -v $1 >/dev/null 2>&1
+}
+
+check_version() {
+    act_runner_version=$(act_runner -v | grep -o 'v[0-9]\+\.[0-9]\+\.[0-9]\+')
+    echo $act_runner_version
+}
+
+if check_command act_runner; then
+    current_version=$(check_version)
+    echo "Current act_runner version: $current_version"
+fi
+
+required_commands=("curl" "jq" "wget" "unxz" "sha256sum")
+for cmd in "${required_commands[@]}"; do
+    if ! check_command $cmd; then
+        echo "Error: '$cmd' command not found. Please make sure all required commands are installed."
+        exit 1
+    fi
+done
+
+arch=$(uname -m)
+if [ "$arch" = "x86_64" ]; then
+    arch="amd64"
+fi
+
+json=$(curl -s https://gitea.com/api/v1/repos/gitea/act_runner/releases/latest)
+latest_version=$(echo $json | jq -r '.tag_name')
+url_checksum=$(echo $json | jq -r '.assets[] | select(.name | contains("linux-'$arch'") and contains(".xz.sha256")) | .browser_download_url')
+url_binary=$(echo $json | jq -r '.assets[] | select(.name | contains("linux-'$arch'") and contains(".xz")) | .browser_download_url')
+checksum_filename=$(basename $url_checksum)
+filename=$(basename $url_binary)
+
+if [ -z "$current_version" ] || [ "$current_version" != "$latest_version" ]; then
+    echo "Updating act_runner to version: $latest_version"
+    wget $url_binary
+    sha256sum -c $checksum_filename
+    rm $checksum_filename
+    unxz $filename
+    filename=$(echo $filename | sed 's/\.xz$//')
+    mv $filename '/usr/local/bin/act_runner'
+    chmod +x /usr/local/bin/act_runner
+    echo "Update completed."
+else
+    echo "act_runner is up to date."
+fi