post to bluesky when manifests uploaded. linting fixes

deploy/.env.prod.template

@@ -87,6 +87,19 @@ HOLD_PUBLIC=false
 # Default: false
 HOLD_ALLOW_ALL_CREW=false
 
+# Enable Bluesky posts when manifests are pushed
+# When enabled, the hold service creates Bluesky posts announcing new container
+# image pushes. Posts include image name, tag, size, and layer count.
+#
+# - true:  Create Bluesky posts for manifest uploads
+# - false: Silent operation (no Bluesky posts)
+#
+# Note: This requires the hold owner to have OAuth credentials for posting.
+# See docs/BLUESKY_MANIFEST_POSTS.md for setup instructions.
+#
+# Default: false
+HOLD_BLUESKY_POSTS_ENABLED=false
+
 # ==============================================================================
 # S3/UpCloud Object Storage Configuration
 # ==============================================================================

deploy/docker-compose.prod.yml

@@ -97,6 +97,7 @@ services:
       HOLD_ALLOW_ALL_CREW: ${HOLD_ALLOW_ALL_CREW:-false}
       HOLD_PUBLIC: ${HOLD_PUBLIC:-false}
       HOLD_OWNER: ${HOLD_OWNER:-}
+      HOLD_BLUESKY_POSTS_ENABLED: ${HOLD_BLUESKY_POSTS_ENABLED:-false}
 
       # Embedded PDS configuration
       HOLD_DATABASE_DIR: ${HOLD_DATABASE_DIR:-/var/lib/atcr-hold}