Handle case where githubWorkflowBuildMatrixAdditions is empty

Author: mdedetrich

.github/workflows/ci.yml

@@ -76,7 +76,7 @@ jobs:
       - name: Upload target directories
         uses: actions/upload-artifact@v3
         with:
-          name: target-${{ matrix.os }}-${{ matrix.java }}-${{ matrix.scala }}-${{ matrix.project }}
+          name: target-${{ matrix.os }}-${{ matrix.java }}-${{ matrix.scala }}
           path: targets.tar
 
   publish:
@@ -124,12 +124,12 @@ jobs:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           cache: sbt
 
-      - name: Download target directories (2.12.18,rootJVM)
+      - name: Download target directories (2.12.18)
         uses: actions/download-artifact@v3
         with:
-          name: target-${{ matrix.os }}-2.12.18-${{ matrix.java }}-2.12.18-rootJVM
+          name: target-${{ matrix.os }}-${{ matrix.java }}-2.12.18
 
-      - name: Inflate target directories (List(2.12.18, rootJVM))
+      - name: Inflate target directories (List(2.12.18))
         run: |
           tar xf targets.tar
           rm targets.tar

src/main/scala/sbtghactions/GenerativePlugin.scala

@@ -636,8 +636,11 @@ ${indent(jobs.map(compileJob(_, sbt)).mkString("\n\n"), 1)}
           List(s"tar cf targets.tar ${sanitized.mkString(" ")} project/target"),
           name = Some("Compress target directories"))
 
-        val keys = githubWorkflowBuildMatrixAdditions
-          .value
+        val matrixAdditions = githubWorkflowBuildMatrixAdditions.value
+        val keys = if (matrixAdditions.isEmpty)
+          ""
+        else
+          matrixAdditions
           .keys
           .toList
           .sorted

src/sbt-test/sbtghactions/no-clean/.github/workflows/ci.yml

@@ -51,7 +51,7 @@ jobs:
       - name: Upload target directories
         uses: actions/upload-artifact@v3
         with:
-          name: target-${{ matrix.os }}-${{ matrix.java }}-${{ matrix.scala }}-
+          name: target-${{ matrix.os }}-${{ matrix.java }}-${{ matrix.scala }}
           path: targets.tar
 
   publish:

src/sbt-test/sbtghactions/non-existent-target/.github/workflows/ci.yml

@@ -50,7 +50,7 @@ jobs:
       - name: Upload target directories
         uses: actions/upload-artifact@v3
         with:
-          name: target-${{ matrix.os }}-${{ matrix.java }}-${{ matrix.scala }}-
+          name: target-${{ matrix.os }}-${{ matrix.java }}-${{ matrix.scala }}
           path: targets.tar
 
   publish:

src/sbt-test/sbtghactions/sbt-native-thin-client/.github/workflows/ci.yml

@@ -67,7 +67,7 @@ jobs:
       - name: Upload target directories
         uses: actions/upload-artifact@v3
         with:
-          name: target-${{ matrix.os }}-${{ matrix.java }}-${{ matrix.scala }}-
+          name: target-${{ matrix.os }}-${{ matrix.java }}-${{ matrix.scala }}
           path: targets.tar
 
   publish:

src/sbt-test/sbtghactions/suppressed-scala-version/expected-ci.yml

@@ -52,7 +52,7 @@ jobs:
       - name: Upload target directories
         uses: actions/upload-artifact@v3
         with:
-          name: target-${{ matrix.os }}-${{ matrix.java }}-${{ matrix.scala }}-
+          name: target-${{ matrix.os }}-${{ matrix.java }}-${{ matrix.scala }}
           path: targets.tar
 
   publish: