feat: Add .cache to .dockerignore and .gitignore to exclude cache files from Docker build context and version control

.codecov.yml

@@ -88,3 +88,4 @@ ignore:
   # Import/data directories
   - "import/**"
   - "data/**"
+  - ".cache/**"

.dockerignore

@@ -197,3 +197,4 @@ VERSION.md
 eslint.config.js
 go.work
 go.work.sum
+.cache

.gitignore

@@ -169,3 +169,4 @@ backend/internal/api/handlers/import_handler.go.bak
 import/
 test-results/charon.hatfieldhosted.com.har
 test-results/local.har
+.cache