add script to download lastest Unbound version for docs

.gitignore

@@ -1,4 +1,5 @@
 build/
 .DS_Store
 .vscode
-source/_build
+source/_build
+source/unbound-*

source/conf.py

@@ -152,6 +152,9 @@
      [author], 1)
 ]
 
+# Execute custom script to download the latest version of Unbound
+exec(open("get_unbound_latest.py").read())
+
 
 # -- Options for Texinfo output ----------------------------------------------
 

source/get_unbound_latest.py

@@ -0,0 +1,19 @@
+import requests
+import tarfile
+import os.path
+from os import path
+
+latest_str = "unbound-latest.tar.gz"
+
+url = "https://nlnetlabs.nl/downloads/unbound/" + latest_str
+
+if path.exists("latest_str"):
+	exit()
+
+r = requests.get(url, allow_redirects=True)
+
+open(latest_str, 'wb').write(r.content)
+
+tar = tarfile.open(latest_str, "r:gz")
+tar.extractall()
+tar.close()