games/valheim: init

This creates a valheim game server, using a public image but slightly
nerfing it to be able to run it unprivileged.

We also deploy our first server. The password is Well Known To Those
Versed In Hackerspace Lore.

Change-Id: Ic24262a3b02d3c17d2f00aa2967e240ea4eee7fb
diff --git a/games/valheim/secrets/plain/.gitignore b/games/valheim/secrets/plain/.gitignore
new file mode 100644
index 0000000..72e8ffc
--- /dev/null
+++ b/games/valheim/secrets/plain/.gitignore
@@ -0,0 +1 @@
+*