feat: Add APK (Alpine Linux) package manager backend; machine-id generation; OpenRC fix; v1.1.12

configs/linux-patch-api.pre-install

@@ -8,6 +8,20 @@ mkdir -p /etc/linux_patch_api/certs
 mkdir -p /var/lib/linux_patch_api
 mkdir -p /var/log/linux_patch_api
 
+# Generate machine-id if not present (required for enrollment)
+# Alpine Linux does not include /etc/machine-id by default
+if [ ! -f /etc/machine-id ] || [ ! -s /etc/machine-id ]; then
+    if command -v uuidgen > /dev/null 2>&1; then
+        uuidgen | tr -d '-' > /etc/machine-id
+    elif [ -f /proc/sys/kernel/random/uuid ]; then
+        cat /proc/sys/kernel/random/uuid | tr -d '-' > /etc/machine-id
+    else
+        # Fallback: generate from /dev/urandom
+        od -x -N4 /dev/urandom | head -1 | awk '{print $2$3}' > /etc/machine-id
+    fi
+    chmod 444 /etc/machine-id
+fi
+
 # Set proper ownership (service runs as root)
 chown -R root:root /var/lib/linux_patch_api
 chown -R root:root /var/log/linux_patch_api