Rename to Containerfile

This was left over from when I tried building external rulesets with an
onbuild hook.

Containerfile

@@ -20,11 +20,13 @@ RUN --mount=type=cache,target=/root/.nuget/packages --mount=type=cache,target=/r
         -p:Version=${OSU_VERSION} \
         osu.Desktop
 
-# Generic builder for rulesets (using onbuild and args)
+# Generic builder for rulesets
 FROM mcr.microsoft.com/dotnet/sdk:8.0 as builder-ruleset-generic
 
 COPY ./build-ruleset.sh /usr/local/bin/build-ruleset
 
+# External rulesets
+
 FROM builder-ruleset-generic as builder-swing
 RUN --mount=type=cache,target=/root/.nuget/packages --mount=type=cache,target=/root/.local/share/NuGet/http-cache build-ruleset https://github.com/EVAST9919/lazer-swing
 
@@ -40,6 +42,7 @@ RUN --mount=type=cache,target=/root/.nuget/packages --mount=type=cache,target=/r
 FROM builder-ruleset-generic as builder-sentakki
 RUN --mount=type=cache,target=/root/.nuget/packages --mount=type=cache,target=/root/.local/share/NuGet/http-cache build-ruleset https://github.com/LumpBloom7/sentakki
 
+# Runtime container
 FROM mcr.microsoft.com/dotnet/runtime:8.0
 
 RUN apt-get update \

README.md

@@ -6,7 +6,7 @@
 
 Using podman/buildah:
 
-    buildah build --format docker --layers -t osu --build-arg OSU_VERSION=2024.412.1 --jobs 0
+    buildah build --layers -t osu --build-arg OSU_VERSION=2024.412.1 --jobs 0
 
 Change `2024.412.1` to the newest osu! version.
 By changing `--jobs 0` to a positive integer N,