Rename other workflow targets to better explain the differences between the runs

Author: JoshuaBehrens

.github/workflows/build-test.yml

@@ -12,7 +12,7 @@ permissions:
     contents: read
 
 jobs:
-    build:
+    self-built-v8:
         strategy:
             # set in accordance with number of v8-versions, so caching can kick in properly
             max-parallel: 2
@@ -107,7 +107,7 @@ jobs:
                         php_test_results*.txt
                         tests/*.out
 
-    alpine:
+    alpine-package-manager-apk:
         runs-on: ubuntu-latest
 
         steps: