Add workflow to resolve itest dependencies (#5422)

* Add workflow to resolve itest dependencies

Automate the process of building with option -DwithResolver
and possibly opening a PR.
This might not always be intended as the resolver does not do
minimalistic changes, but removes older dependency versions and adds
new ones at the end of the bndrun file. But it mitigates the problem that
itests fail silently due to missing dependencies (which is still the
case with bndtools 7.2.1).

Signed-off-by: Holger Friedrich <mail@holger-friedrich.de>

.github/workflows/resolver.yml

@@ -0,0 +1,62 @@
+name: Resolve itest dependencies
+
+on:
+  schedule:
+    - cron: '0 19 * * *'
+  workflow_dispatch:
+
+jobs:
+  resolve:
+    name: Resolve itest dependencies
+    runs-on: 'ubuntu-24.04'
+    permissions:
+      contents: write
+      pull-requests: write
+    # typical duration is ~15min, set twice the amount as limit (default is 6h)
+    timeout-minutes: 30
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+
+      - name: Set up Java 21
+        uses: actions/setup-java@v5
+        with:
+          distribution: 'temurin'
+          java-version: '21'
+
+      - name: Set up Cache
+        uses: actions/cache@v5
+        with:
+          path: |
+            ~/.m2/repository
+            !~/.m2/repository/org/openhab
+          key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
+          restore-keys: |
+            ${{ runner.os }}-maven-
+
+      - name: Build and resolve dependencies
+        id: build
+        # call mvnw directly to avoid filtering of the log by the wrapper,
+        # use more cores, safe to do so as we skip tests (which might depend on load)
+        run: './mvnw verify -B -T 2.5C -U -DskipChecks -DskipTests -DwithResolver'
+        env:
+          MAVEN_OPTS: >-
+            -Xmx2g
+            -Dmaven.wagon.http.retryHandler.count=5
+            -Dmaven.wagon.httpconnectionManager.ttlSeconds=25
+            -Dorg.slf4j.simpleLogger.log.org.apache.maven.cli.transfer.Slf4jMavenTransferListener=warn
+
+      - name: Show Resolver Status
+        run: |
+          git branch -v
+          git status
+          git diff
+
+      - name: Open PR if changed
+        uses: peter-evans/create-pull-request@c0f553fe549906ede9cf27b5156039d195d2ece0 # 8.1.0
+        with:
+          commit-message: "Resolve itest dependencies"
+          title: "Resolve itest dependencies"
+          branch: "gha/resolver/${{ github.ref_name }}"
+          delete-branch: true
+          # labels: infrastructure