Add tool for bumping images

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Depends-On: https://review.vexxhost.dev/c/atmosphere/+/555
Change-Id: I500b01ef58b54680e52c04f3c4576b640e07e1be
(cherry picked from commit 7f6414c93f48dca1677c67a19ad4b5de6b233209)
diff --git a/crates/imagebumper/src/clients/mod.rs b/crates/imagebumper/src/clients/mod.rs
new file mode 100644
index 0000000..8c2bfde
--- /dev/null
+++ b/crates/imagebumper/src/clients/mod.rs
@@ -0,0 +1,19 @@
+pub mod github;
+pub mod opendev;
+
+use crate::clients::github::Client as GitHubClient;
+use crate::clients::opendev::Client as OpenDevClient;
+
+pub struct ClientSet {
+    pub github: GitHubClient,
+    pub opendev: OpenDevClient,
+}
+
+impl ClientSet {
+    pub fn new() -> Self {
+        ClientSet {
+            github: GitHubClient::new(),
+            opendev: OpenDevClient::new(),
+        }
+    }
+}