chore: start testing on Bazel 8

.bcr/presubmit.yml

@@ -2,7 +2,10 @@ bcr_test_module:
   module_path: "e2e/smoke"
   matrix:
     platform: ["debian10", "macos", "ubuntu2004", "windows"]
-    bazel: ["7.x", "6.x"]
+    bazel:
+      - 6.x
+      - 7.x
+      - last_rc # TODO(alexeagle): change to 8.x after release
   tasks:
     run_tests:
       name: "Run test module"

.github/workflows/ci.yaml

@@ -27,6 +27,7 @@ jobs:
           v=$(head -n 1 .bazelversion)
           m=${v::1}
           a=(
+            "major:8, version:\"last_rc\""
             "major:$m, version:\"$v\""
             "major:6, version:\"6.5.0\""
           )
@@ -138,7 +139,6 @@ jobs:
       - name: Verify bcr patches
         if: matrix.folder == '.' && matrix.bzlmod == '1' && matrix.os == 'ubuntu' && matrix.bazel-version.major != '6'
         run: patch --dry-run -p1 < .bcr/patches/*.patch
-
   # For branch protection settings, this job provides a "stable" name that can be used to gate PR merges
   # on "all matrix jobs were successful".
   conclusion:
@@ -147,14 +147,12 @@ jobs:
     if: always()
     steps:
       - uses: technote-space/workflow-conclusion-action@45ce8e0eb155657ab8ccf346ade734257fd196a5 # v3.0.3
-
       # Note: possible conclusion values:
       # https://github.com/technote-space/workflow-conclusion-action/blob/main/src/constant.ts
       - name: report success
         if: ${{ env.WORKFLOW_CONCLUSION == 'success' }}
         working-directory: /tmp
         run: echo ${{ env.WORKFLOW_CONCLUSION }} && exit 0
-
       - name: report failure
         if: ${{ env.WORKFLOW_CONCLUSION == 'failure' }}
         working-directory: /tmp