Reduce recurring steps in CI workflow

.github/actions/setup/action.yml

@@ -0,0 +1,34 @@
+name: setup
+description: "Setup Java"
+inputs:
+  java-version:
+    description: "Java version to setup"
+    default: 17
+  cache:
+    description: "Cache Maven repo"
+    default: true
+
+runs:
+  using: composite
+  steps:
+      - name: Fetch base ref to find merge-base for GIB
+        shell: bash
+        run: .github/bin/git-fetch-base-ref.sh
+      - uses: actions/setup-java@v3
+        if: ${{ inputs.java-version != '' }}
+        with:
+          distribution: 'zulu'
+          java-version: ${{ inputs.java-version }}
+      - name: Cache local Maven repo
+        id: cache
+        if: ${{ inputs.cache }}
+        uses: actions/cache@v3
+        with:
+          path: ~/.m2/repository
+          key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
+          restore-keys: |
+            ${{ runner.os }}-maven-
+      - name: Configure Problem Matchers
+        if: ${{ inputs.java-version != '' }}
+        shell: bash
+        run: echo "::add-matcher::.github/problem-matcher.json"

.github/actions/upload/action.yml

@@ -0,0 +1,31 @@
+name: upload
+description: "Upload test results"
+inputs:
+  name-suffix:
+    default: ${{ github.job }}
+  test-report-retention-days:
+    default: 5
+
+runs:
+  using: composite
+  steps:
+    - name: Upload test results
+      uses: actions/upload-artifact@v3
+      # Upload all test reports only on failure, because the artifacts are large
+      if: failure()
+      with:
+        name: result ${{ inputs.name-suffix }}
+        path: |
+          **/target/surefire-reports
+          **/target/checkstyle-*
+    - name: Upload test report
+      uses: actions/upload-artifact@v3
+      # Always upload the test report for the annotate.yml workflow,
+      # but only the single XML file to keep the artifact small
+      if: always()
+      with:
+        # Name prefix is checked in the `Annotate checks` workflow
+        name: test report ${{ inputs.name-suffix }}
+        path: |
+          **/surefire-reports/TEST-*.xml
+        retention-days: ${{ inputs.test-report-retention-days }}