maven-central then bilt-maven

[kenkania]

Make run_test.sh accept an overridable REPO_URL and always generate Maven settings.xml to support performance-focused Perf2 changes

• Update run_test.sh to use REPO_URL=${REPO_URL:-artifactregistry://...} and always write a settings.xml that includes central (https://repo.maven.apache.org/maven2) and bilt-maven (artifactregistry://.../bilt-maven) for both repositories and pluginRepositories; build the custom wagon and write .mvn/extensions.xml only when REPO_URL is non-empty.
• Add README_bilt.md documenting the Bilt AR Wagon fork usage, interface flags, performance notes, and future improvements.
• Introduce tests/bilt-1-artifact/pom.xml defining org.acme:slow:1.0.0-SNAPSHOT with dependency on com.biltcard.common:egress-proxy:1.1.2 and Java 21 compiler plugin configuration.

📍Where to Start

Start in the run_test function within run_test.sh, then review the SETTINGS_XML generation and conditional wagon setup.

---

Macroscope summarized edf6282. (Automatic summaries will resume when PR exits draft mode or review begins).

[macroscopeapp]

Issue on line in run_test.sh:91:

Maven will always reference the artifactregistry:// URLs in settings.xml, but the Artifact Registry wagon is only configured when REPO_URL is set. If a user clears REPO_URL, Maven will fail to resolve those URLs without the wagon installed.

The root cause is that settings.xml is generated unconditionally with artifactregistry:// repositories, while the wagon (via extensions.xml) is only installed inside the if [[ -n "$REPO_URL" ]] block.

Consider only writing and using the custom settings.xml when REPO_URL is non-empty, so that Maven falls back to its default central repository behavior when no Artifact Registry URL is provided.

+    if [[ -n "$REPO_URL" ]]; then
-    echo "$SETTINGS_XML" > $run_dir/settings.xml
-    cmd="$cmd -s settings.xml"
+        echo "$SETTINGS_XML" > $run_dir/settings.xml
+        cmd="$cmd -s settings.xml"
+    fi

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