Add ECS E2E test into main build (aws-observability#890)

This PR do the following two things:
1. Fix [recent main build
failure](https://github.com/aws-observability/aws-otel-java-instrumentation/actions/runs/10926150649/job/30330248240)
by updating Dockerfile syntax.

2. Add ECS E2E test entry point into main build.

An example of succeed test workflow: 

https://github.com/aws-observability/aws-otel-java-instrumentation/actions/runs/10926900740
(E2E operator test failure is expected, will plan on the effort fixing
it).

By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache 2.0 license.

Author: zzhlogin

.github/workflows/application-signals-e2e-test.yml

@@ -76,6 +76,14 @@ jobs:
   java-k8s-e2e-test:
     uses: aws-observability/aws-application-signals-test-framework/.github/workflows/java-k8s-test.yml@main
     secrets: inherit
+    with:
+      aws-region: us-east-1
+      adot-image-name: ${{ inputs.adot-image-name }}
+      caller-workflow-name: 'main-build'
+
+  java-ecs-e2e-test:
+    uses: aws-observability/aws-application-signals-test-framework/.github/workflows/java-ecs-test.yml@main
+    secrets: inherit
     with:
       aws-region: us-east-1
       adot-image-name: ${{ inputs.adot-image-name }}

Dockerfile

@@ -51,4 +51,4 @@ ARG ADOT_JAVA_VERSION
 COPY --from=builder /usr/src/cp-utility/bin/cp-utility /bin/cp
 
 
-COPY --chmod=go+r ./otelagent/build/libs/aws-opentelemetry-agent-${ADOT_JAVA_VERSION}.jar  /javaagent.jar
+COPY --chmod=0644 ./otelagent/build/libs/aws-opentelemetry-agent-${ADOT_JAVA_VERSION}.jar  /javaagent.jar