Change test job keys from build to test

This goes a bit further in the direction of the preceding commit,
making CI reports/logs a bit more intuitive.

Author: EliahKagan

.github/workflows/alpine-test.yml

@@ -3,7 +3,7 @@ name: test-alpine
 on: [push, pull_request, workflow_dispatch]
 
 jobs:
-  build:
+  test:
     runs-on: ubuntu-latest
 
     container:

.github/workflows/cygwin-test.yml

@@ -3,7 +3,7 @@ name: test-cygwin
 on: [push, pull_request, workflow_dispatch]
 
 jobs:
-  build:
+  test:
     runs-on: windows-latest
 
     strategy:

.github/workflows/pythonpackage.yml

@@ -9,7 +9,7 @@ permissions:
   contents: read
 
 jobs:
-  build:
+  test:
     strategy:
       matrix:
         os-type: [ubuntu, macos, windows]