Add dockerfile to build uninstrumented version (#390)

Author: psx95

examples/instrumentation-quickstart/uninstrumented.Dockerfile

@@ -0,0 +1,31 @@
+# Copyright 2025 Google LLC
+#
+# 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.
+
+FROM eclipse-temurin:17-jdk-alpine AS build
+WORKDIR /workspace/app
+
+COPY . /workspace/app
+RUN --mount=type=cache,target=/root/.gradle ./gradlew clean build
+RUN mkdir -p build/dependency && (cd build/dependency; jar -xf ../libs/*-SNAPSHOT.jar)
+
+FROM eclipse-temurin:17-jdk-alpine
+VOLUME /tmp
+ARG DEPENDENCY=/workspace/app/build/dependency
+COPY --from=build ${DEPENDENCY}/BOOT-INF/lib /app/lib
+COPY --from=build ${DEPENDENCY}/META-INF /app/META-INF
+COPY --from=build ${DEPENDENCY}/BOOT-INF/classes /app
+
+CMD sh -c "java -cp app:app/lib/* com.example.demo.DemoApplication \
+	2>&1 | tee /var/log/app.log"
+EXPOSE 8080