Periodic image garbage collection (#129)

* Add periodic image garbage collection

kustomize/overlays/dev/registry.yaml

@@ -17,11 +17,18 @@ spec:
       containers:
         - name: ttl-registry
           image: registry:2
+          command: ["/entrypoint.sh"]
           ports:
             - containerPort: 5000
           volumeMounts:
             - name: registry-data
               mountPath: /var/lib/registry
+            - name: registry-scripts
+              mountPath: /entrypoint.sh
+              subPath: entrypoint.sh
+            - name: registry-scripts
+              mountPath: /garbage-collect.sh
+              subPath: garbage-collect.sh
             - name: registry-config
               mountPath: /etc/docker/registry/config.yml
               subPath: config.yml
@@ -40,12 +47,38 @@ spec:
           emptyDir: {}
         - name: registry-config
           configMap:
-            name: registry-config
+            name: ttl-registry-config
+        - name: registry-scripts
+          configMap:
+            name: ttl-registry-scripts
+            defaultMode: 0755
+---
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: ttl-registry-scripts
+  labels:
+    app: ttl-registry
+data:
+  entrypoint.sh: |
+    #!/bin/sh
+    set -e
+    echo "0 * * * * /garbage-collect.sh >> /proc/1/fd/1 2>&1" > /etc/crontabs/root
+    crond
+    registry serve /etc/docker/registry/config.yml
+  garbage-collect.sh: |
+    #!/bin/sh
+    set -e
+    if [ ! -d "/var/lib/registry/docker" ]; then
+      echo "No registry data found, skipping garbage collection"
+      exit 0
+    fi
+    registry garbage-collect /etc/docker/registry/config.yml
 ---
 apiVersion: v1
 kind: ConfigMap
 metadata:
-  name: registry-config
+  name: ttl-registry-config
   labels:
     app: ttl-registry
 data:

registry/Dockerfile

@@ -1,7 +1,8 @@
 FROM registry:2.7.1
 
-ADD ./entrypoint.sh /heroku-entrypoint.sh
+ADD ./entrypoint.sh /entrypoint.sh
 ADD ./config.yml /etc/docker/registry/config.yml
+ADD ./garbage-collect.sh /garbage-collect.sh
 
-ENTRYPOINT ["/heroku-entrypoint.sh"]
+ENTRYPOINT ["/entrypoint.sh"]
 CMD ["/etc/docker/registry/config.yml"]

registry/entrypoint.sh

@@ -15,6 +15,10 @@ else
   chmod 0400 /etc/gcs.json
 fi
 
+# Run garbage collection job in background
+echo "0 * * * * /garbage-collect.sh >> /proc/1/fd/1 2>&1" > /etc/crontabs/root
+crond
+
 case "$1" in
     *.yaml|*.yml) set -- registry serve "$@" ;;
     serve|garbage-collect|help|-*) set -- registry "$@" ;;

registry/garbage-collect.sh

@@ -0,0 +1,5 @@
+#!/bin/sh
+
+echo "Starting garbage collection..."
+
+registry garbage-collect /etc/docker/registry/config.yml