add .dockerignore file

.dockerignore

@@ -0,0 +1,36 @@
+# Copyright The Conforma Contributors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+# Exclude pre-built binaries to prevent copying host's dist/ into the build stage.
+# This is critical for multi-arch builds where each architecture should only have
+# its own built binaries, not all binaries from the host.
+dist/
+
+# Exclude coverage output files
+*.out
+
+# Exclude node modules (used for tekton-lint)
+node_modules/
+
+# Exclude IDE and editor files
+.idea/
+.vscode/
+*.swp
+*.swo
+
+# Exclude test artifacts
+acceptance/testenv/
+