chore(ubi-rust-builders): Remove ubi8-rust-builder

Author: NickLarsenNZ

.github/ISSUE_TEMPLATE/update-base-ubi-rust-builders.md

@@ -51,8 +51,7 @@ Add/Change/Remove anything that isn't applicable anymore
 > This list should be completed by the assignee(s), once respective PRs have been merged. Once all items have been
 > checked, the issue can be moved into _Development: Done_.
 
-- Done for [ubi8-rust-builder/Dockerfile](https://github.com/stackabletech/docker-images/blob/main/ubi8-rust-builder/Dockerfile)
-- Done for [ubi9-rust-builder/Dockerfile](https://github.com/stackabletech/docker-images/blob/main/ubi9-rust-builder/Dockerfile)
+- [ ] Done for [ubi9-rust-builder/Dockerfile](https://github.com/stackabletech/docker-images/blob/main/ubi9-rust-builder/Dockerfile)
 - [ ] Can build the image locally
 - [ ] Can build an operator image
 

.github/workflows/ubi-rust-builder.yml

@@ -19,7 +19,7 @@ jobs:
       fail-fast: false
       matrix:
         runner: ["ubuntu-latest", "ubicloud-standard-8-arm"]
-        ubi-version: ["ubi8", "ubi9"]
+        ubi-version: ["ubi9"]
     runs-on: ${{ matrix.runner }}
     steps:
       - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
@@ -59,7 +59,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ubi-version: ["ubi8", "ubi9"]
+        ubi-version: ["ubi9"]
     runs-on: ubuntu-latest
     needs: ["build"]
     steps:

CHANGELOG.md

@@ -56,6 +56,7 @@ All notable changes to this project will be documented in this file.
 
 - ci: Remove Nexus steps from build, mirror and release workflows ([#1056]).
   Also remove the old release workflow.
+- ubi8-rust-builder ([#1091]).
 
 [#1025]: https://github.com/stackabletech/docker-images/pull/1025
 [#1027]: https://github.com/stackabletech/docker-images/pull/1027
@@ -75,6 +76,7 @@ All notable changes to this project will be documented in this file.
 [#1054]: https://github.com/stackabletech/docker-images/pull/1054
 [#1055]: https://github.com/stackabletech/docker-images/pull/1055
 [#1056]: https://github.com/stackabletech/docker-images/pull/1056
+[#1091]: https://github.com/stackabletech/docker-images/pull/1091
 
 ## [25.3.0] - 2025-03-21