Switch JDK8u to use Skara mirror and update RELEASING.md (#2799)

* Switch JDK8u to use Skara mirror and update RELEASING.md

* Update RELEASING.md

Author: gdams

RELEASING.md

@@ -124,8 +124,9 @@ Here are the steps:
    - [OpenJ9 only] `scmReference`: extensions release branch: e.g. `openj9-0.14.0`
    - `additionalConfigureArgs`: JDK8 automatically adds`--with-milestone=fcs` in `build.sh` so there's no need to provide it here. For JDK11+ use `--without-version-pre --without-version-opt` (for EA releases use: `--with-version-pre=ea --without-version-opt`)
    - `scmReference`: One of the following:
-     - For HotSpot JDK8, use the openjdk tag as-is e.g. `jdk8u232-b09`
-     - For HotSpot JDK11+, it's the same tag suffixed with `_adopt` e.g. `jdk-13.0.1+9_adopt`
+     - For HotSpot, it's the same tag suffixed with `_adopt` e.g. `jdk-13.0.1+9_adopt`
+     - For HotSpot (arm32), the tag usually takes the form `jdk8u322-b04-aarch32-xxxxxxxx`
+     - NOTE you need to set `overridePublishName` for arm32 to the actual OpenJDK tag (`jdk8u322-b04`)
      - For OpenJ9 (all versions) use the OpenJ9 branch e.g. `openj9-0.15.1`
    - `enableTests`: tick
    - SUBMIT!!

sbin/prepareWorkspace.sh

@@ -101,7 +101,7 @@ checkoutAndCloneOpenJDKGitRepo() {
     fi
   fi
 
-  if [[ "${BUILD_CONFIG[BUILD_VARIANT]}" == "${BUILD_VARIANT_HOTSPOT}" ]] && [[ "${BUILD_CONFIG[OPENJDK_FEATURE_NUMBER]}" -ge 11 ]]; then
+  if [[ "${BUILD_CONFIG[BUILD_VARIANT]}" == "${BUILD_VARIANT_HOTSPOT}" ]]; then
     # Verify Adopt patches tag is being built, otherwise we may be accidently just building "raw" OpenJDK
     if [ ! -f "${TEMURIN_MARKER_FILE}" ] && [ "${BUILD_CONFIG[DISABLE_ADOPT_BRANCH_SAFETY]}" == "false" ]; then
       echo "${TEMURIN_MARKER_FILE} marker file not found in fetched source to be built, this may mean the wrong SCMReference build parameter has been specified. Ensure the correct Temurin patch release tag is specified, eg.for build jdk-11.0.4+10, it would be jdk-11.0.4+10_adopt"