chore: remove .build-cache directories from git tracking and add to gitignore

ToolboxStack/.gitignore

@@ -0,0 +1,22 @@
+# Docker build caches
+.build-cache/
+output/*/\.build-cache/
+
+# Backup files
+*.backup*
+*.bak
+*.orig
+
+# Temporary files
+tmp/
+*.tmp
+
+# IDE files
+.vscode/
+.idea/
+*.swp
+*.swo
+
+# OS generated files
+.DS_Store
+Thumbs.db

ToolboxStack/output/toolbox-QADocker/.build-cache/index.json

@@ -1 +0,0 @@
-{"schemaVersion":2,"mediaType":"application/vnd.oci.image.index.v1+json","manifests":[{"mediaType":"application/vnd.oci.image.manifest.v1+json","digest":"sha256:b67ce052e76b308d4e0f2e7d1a9dab6b078f9b22d981f7ab36916ea34f2ff06f","size":8758,"annotations":{"org.opencontainers.image.ref.name":"latest"}}]}

ToolboxStack/output/toolbox-QADocker/.build-cache/oci-layout

@@ -1 +0,0 @@
-{"imageLayoutVersion":"1.0.0"}