fix missing junit

Builds were failing because `junit` was not installed. Use a dedicated
action plugin to ensure it is available and also publish the test report
on PR's for convenient viewing. For now we don't create an actual PR
check, only annotations, because the check is currently sent to the
wrong build. See
mikepenz/action-junit-report#40.

.editorconfig

@@ -9,3 +9,6 @@ indent_size = 4
 # no particular reason, just specifying how our files are currently formatted
 [*.soar]
 indent_size = 3
+
+[*.yml]
+indent_size = 2

.github/workflows/build.yml

@@ -55,7 +55,18 @@ jobs:
 
       - name: unit tests
         working-directory: ./out
-        run: ./UnitTests -e PRIMS_Sanity1 -e PRIMS_Sanity2 -f testSmemArithmetic && junit TestResults.xml
+        run: ./UnitTests -e PRIMS_Sanity1 -e PRIMS_Sanity2 -f testSmemArithmetic
+
+      # reports JUnit test results as GitHub PR check.
+      - name: publish test report
+        uses: mikepenz/action-junit-report@v3
+        # always run even if the previous step fails
+        if: always()
+        with:
+          report_paths: './out/TestResults.xml'
+          # disabled until https://github.com/mikepenz/action-junit-report/issues/40 is resolved
+          # fail_on_failure: true
+          annotate_only: true
       # TODO: run Python SML test
 
   Windows:
@@ -96,5 +107,17 @@ jobs:
 
       - name: unit tests
         working-directory: ./out
-        run: ./UnitTests -e PRIMS_Sanity1 -e PRIMS_Sanity2 -f testSmemArithmetic && junit TestResults.xml
+        run: ./UnitTests -e PRIMS_Sanity1 -e PRIMS_Sanity2 -f testSmemArithmetic
+
+      # reports JUnit test results as GitHub PR check.
+      - name: publish test report
+        uses: mikepenz/action-junit-report@v3
+        # always run even if the previous step fails
+        if: always()
+        with:
+          report_paths: './out/TestResults.xml'
+          # disabled until https://github.com/mikepenz/action-junit-report/issues/40 is resolved
+          # fail_on_failure: true
+          annotate_only: true
+
       # TODO: run Python SML test