fix(ci): bump IBM Java 8 JRE URL to 8.0.8.70

[jbachorik]

What does this PR do?:
Bumps JAVA_8_IBM_URL in .github/workflows/cache_java.yml from IBM Semeru/JRE build 8.0.8.60 to 8.0.8.70.

Motivation:
The pinned 8.0.8.60 IBM JRE tarball now 404s (IBM has removed it from public.dhe.ibm.com), which fails the cache-jdks / cache-amd64 (8-ibm) job and cascades into cancelling the entire test matrix for every PR. 8.0.8.70 is the latest build currently published at that path (verified reachable with curl -I).

Additional Notes:
Pure CI infra fix, no product code touched. Found while investigating an unrelated PR (#483) failing in this same job.

How to test the change?:
CI itself validates this: the cache-jdks / cache-amd64 (8-ibm) job should now download successfully instead of 404ing.

For Datadog employees:

• This PR doesn't touch any of that.
• JIRA: N/A

[Copilot]

Pull request overview

Updates the GitHub Actions JDK caching workflow to restore the IBM Java 8 JRE download by bumping the pinned Semeru/OpenJ9 JRE tarball URL from 8.0.8.60 (now 404) to 8.0.8.70, unblocking the cache-jdks / cache-amd64 (8-ibm) job and preventing downstream CI matrix cancellations.

Changes:

• Bump JAVA_8_IBM_URL in .github/workflows/cache_java.yml to IBM JRE build 8.0.8.70.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[dd-octo-sts]

Scan-Build Report

User:	runner@runnervmvrwv9
Working Directory:	/home/runner/work/java-profiler/java-profiler/ddprof-lib/src/test/make
Command Line:	make -j4 all
Clang Version:	Ubuntu clang version 18.1.3 (1ubuntu1)
Date:	Tue Aug 4 14:13:29 2026

Bug Summary

Bug Type	Quantity	Display?
All Bugs	1
Logic error
Dereference of null pointer	1

Reports

Bug Group	Bug Type ▾	File	Function/Method	Line	Path Length
Logic error	Dereference of null pointer	profiler.h	findLibraryByAddress	517	13

[dd-octo-sts]

CI Test Results

Run: #30918347991 | Commit: f2231c3 | Duration: 3h 0m 16s (longest job)

✅ All 32 test jobs passed

Status Overview

JDK	glibc-aarch64/debug	glibc-amd64/debug	musl-aarch64/debug	musl-amd64/debug
8	-	✅	-	-
8-ibm	-	✅	-	-
8-j9	✅	✅	-	-
8-librca	-	-	✅	✅
8-orcl	-	✅	-	-
11	-	✅	-	-
11-j9	✅	✅	-	-
11-librca	-	-	✅	✅
17	✅	✅	-	-
17-graal	✅	✅	-	-
17-j9	✅	✅	-	-
17-librca	-	-	✅	✅
21	✅	✅	-	-
21-graal	✅	✅	-	-
21-librca	-	-	✅	✅
25	🚫	✅	-	-
25-graal	✅	✅	-	-
25-librca	-	-	✅	✅

Legend: ✅ passed | ❌ failed | ⚪ skipped | 🚫 cancelled

Summary: Total: 32 | Passed: 31 | Failed: 0 | Cancelled: 1

---

Updated: 2026-08-04 17:23:15 UTC