Add Windows to GitHub Actions workflow

Co-Authored-By: marko-bekhta <marko.prykladna@gmail.com>

.github/workflows/build.yml

@@ -1,6 +1,8 @@
 # The main CI of Hibernate Search is https://ci.hibernate.org/job/hibernate-search/.
 # However, Hibernate Search builds run on GitHub actions regularly
-# to check that it still works and can be used in GitHub forks.
+# to build on Windows
+# and check that both the Linux and Windows workflows still work
+# and can be used in GitHub forks.
 # See https://docs.github.com/en/actions
 # for more information about GitHub actions.
 
@@ -36,25 +38,43 @@ env:
   MAVEN_ARGS: "-e -B --settings .github/mvn-settings.xml --fail-at-end"
 jobs:
   build:
-    name: Linux - JDK 17
-    runs-on: ubuntu-latest
+    name: ${{matrix.os.name}}
+    runs-on: ${{ matrix.os.runs-on }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+          - {
+            name: "Linux JDK 17",
+            runs-on: 'ubuntu-latest',
+            java: {
+              version: 17
+            }
+          }
+          - {
+            name: "Windows JDK 17",
+            runs-on: 'windows-latest',
+            java: {
+              version: 17
+            }
+          }
     steps:
+      - name: Support longpaths on Windows
+        if: "startsWith(matrix.os.runs-on, 'windows')"
+        run: git config --global core.longpaths true
       - uses: actions/checkout@v4
-      - name: Set up Java 17
+      - name: Set up Java ${{ matrix.os.java.version }}
         uses: actions/setup-java@v1
         with:
-          java-version: 17
-      - name: Generate .m2 cache key
-        id: m2-cache-key
-        run: |
-          echo "key=m2-cache-$(/bin/date -u "+%Y-%U")" >> $GITHUB_OUTPUT
-      - name: Cache Maven local repository
-        id: cache-maven
+          java-version: ${{ matrix.os.java.version }}
+      # https://github.com/actions/cache/blob/main/examples.md#java---maven
+      - name: Cache local Maven repository
         uses: actions/cache@v3
         with:
           path: ~/.m2/repository
-          # refresh cache every week to avoid unlimited growth
-          key: ${{ steps.m2-cache-key.outputs.key }}
+          key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
+          restore-keys: |
+            ${{ runner.os }}-maven-
       - name: Set up Maven
         run: ./mvnw -v
       - name: Docker cleanup