fix(tests): quote regex patterns in matchRegex assertions

Fix YAML syntax errors where patterns containing colons need to be quoted
to avoid being interpreted as YAML mapping values.

Affected files:
- deployment_image_test.yaml
- regression_defaults_test.yaml

Co-Authored-By: Claude <noreply@anthropic.com>
Signed-off-by: Aleksei Sviridkin <f@lex.la>

charts/jellyfin/tests/deployment_image_test.yaml

@@ -18,7 +18,7 @@ tests:
     asserts:
       - matchRegex:
           path: spec.template.spec.containers[0].image
-          pattern: ^ghcr\.io/jellyfin/jellyfin:
+          pattern: "^ghcr\\.io/jellyfin/jellyfin:"
 
   - it: should use private registry
     set:
@@ -26,7 +26,7 @@ tests:
     asserts:
       - matchRegex:
           path: spec.template.spec.containers[0].image
-          pattern: ^registry\.example\.com/jellyfin/jellyfin:
+          pattern: "^registry\\.example\\.com/jellyfin/jellyfin:"
 
   # =============================================================================
   # IMAGE TAG
@@ -36,7 +36,7 @@ tests:
     asserts:
       - matchRegex:
           path: spec.template.spec.containers[0].image
-          pattern: :RELEASE-VERSION$
+          pattern: ":RELEASE-VERSION$"
 
   - it: should use custom tag when specified
     set:

charts/jellyfin/tests/regression_defaults_test.yaml

@@ -39,7 +39,7 @@ tests:
     asserts:
       - matchRegex:
           path: spec.template.spec.containers[0].image
-          pattern: ^jellyfin/jellyfin:
+          pattern: "^jellyfin/jellyfin:"
 
   - it: should use IfNotPresent pullPolicy by default
     template: deployment.yaml