add astra 1.8

platforms.json

@@ -16,6 +16,22 @@
         "echo \"deb https://ppa.${domain}/ ${codename} main\" | sudo tee /etc/apt/sources.list.d/SHS.list"
       ]
     },
+    "Astra Linux 1.8": {
+      "enabled": true,
+      "ondemand": true,
+      "codename": "astra1.8",
+      "docker_dir": "astra1.8",
+      "docker_image": "astra1.8",
+      "docker_build_options": {
+        "image_from": "debian:bullseye-slim",
+        "image_prepare_script": "install_apt.sh"
+      },
+      "ppa_filters": ["astra1.8"],
+      "ppa_instructions": [
+        "wget -qO - https://ppa.${domain}/SHS.gpg | sudo apt-key add -",
+        "echo \"deb https://ppa.${domain}/ ${codename} main\" | sudo tee /etc/apt/sources.list.d/SHS.list"
+      ]
+    },
     "Debian 10": {
       "enabled": true,
       "codename": "buster",