build: package the server as an OCI container image

docker/itsybitsy.toml

@@ -0,0 +1,37 @@
+version = 1
+
+[site.demo]
+root = "./content"
+hosts = ["localhost", "127.0.0.1"]
+
+[listener.web]
+protocol = "http"
+bind = "0.0.0.0:8080"
+formats = ["wml", "xhtmlmp", "html"]
+default_site = "demo"
+
+[listener.spartan]
+protocol = "spartan"
+bind = "0.0.0.0:3000"
+formats = ["gemtext"]
+default_site = "demo"
+
+[listener.nex]
+protocol = "nex"
+bind = "0.0.0.0:1900"
+formats = ["text"]
+site = "demo"
+
+# Plaintext: a TLS terminator in front of the container owns 1965 and forwards
+# here, as it does when deployed bare.
+[listener.gemini]
+protocol = "gemini"
+bind = "0.0.0.0:1965"
+formats = ["gemtext"]
+default_site = "demo"
+
+[listener.gopher]
+protocol = "gopher"
+bind = "0.0.0.0:7070"
+formats = ["text"]
+site = "demo"