Allow overriding ruby source url during build time

This makes it possible to build against ruby master (as long as there are no additional changes that need to be made) A sample `docker-compose.yml`: ``` services: ruby: build: args: RUBY_VERSION: 3.4-dev RUBY_DOWNLOAD_URL: https://cache.ruby-lang.org/pub/ruby/snapshot/snapshot-master.tar.xz SKIP_CHECKSUM_CHECK: 1 dockerfile: 3.3/alpine3.19/Dockerfile ```
docker-library · Apr 25, 2024 · 5ff55bc · 5ff55bc
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diff --git a/3.1/alpine3.18/Dockerfile b/3.1/alpine3.18/Dockerfile
diff --git a/3.1/alpine3.19/Dockerfile b/3.1/alpine3.19/Dockerfile
diff --git a/3.1/bookworm/Dockerfile b/3.1/bookworm/Dockerfile
diff --git a/3.1/bullseye/Dockerfile b/3.1/bullseye/Dockerfile
diff --git a/3.1/slim-bookworm/Dockerfile b/3.1/slim-bookworm/Dockerfile
diff --git a/3.1/slim-bullseye/Dockerfile b/3.1/slim-bullseye/Dockerfile
diff --git a/3.2/alpine3.18/Dockerfile b/3.2/alpine3.18/Dockerfile
diff --git a/3.2/alpine3.19/Dockerfile b/3.2/alpine3.19/Dockerfile
diff --git a/3.2/bookworm/Dockerfile b/3.2/bookworm/Dockerfile
diff --git a/3.2/bullseye/Dockerfile b/3.2/bullseye/Dockerfile
diff --git a/3.2/slim-bookworm/Dockerfile b/3.2/slim-bookworm/Dockerfile
diff --git a/3.2/slim-bullseye/Dockerfile b/3.2/slim-bullseye/Dockerfile
diff --git a/3.3/alpine3.18/Dockerfile b/3.3/alpine3.18/Dockerfile