TIKA-4703: Fix tika-grpc Docker image missing runtime dependencies

The docker build context only copied the thin jar (tika-grpc-X.jar) but
not the lib/ directory containing all runtime dependencies. The jar's
MANIFEST.MF Class-Path references lib/*.jar relative to the jar location,
so without that directory Java throws:

  NoClassDefFoundError: io/grpc/BindableService

Fix: unzip the Maven assembly zip (which bundles the jar + lib/) and copy
both into the build context. The Dockerfile COPY libs/ -> /tika/libs/ then
places them at:
  /tika/libs/tika-grpc-X.jar      (the main jar)
  /tika/libs/lib/*.jar             (runtime deps, per MANIFEST Class-Path)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: nddipiazza

.github/workflows/docker-release.yml

@@ -114,7 +114,11 @@ jobs:
 
           mkdir -p "${OUT_DIR}/libs" "${OUT_DIR}/plugins" "${OUT_DIR}/config" "${OUT_DIR}/bin"
 
-          cp "tika-grpc/target/tika-grpc-${TIKA_VERSION}.jar" "${OUT_DIR}/libs/"
+          # The assembly zip contains the jar + lib/ (runtime deps referenced by MANIFEST.MF Class-Path)
+          unzip -q "tika-grpc/target/tika-grpc-${TIKA_VERSION}.zip" -d "${OUT_DIR}/libs_tmp"
+          cp "${OUT_DIR}/libs_tmp/tika-grpc-${TIKA_VERSION}.jar" "${OUT_DIR}/libs/"
+          cp -r "${OUT_DIR}/libs_tmp/lib" "${OUT_DIR}/libs/lib"
+          rm -rf "${OUT_DIR}/libs_tmp"
 
           # Copy tika-pipes plugin zip files
           for dir in tika-pipes/tika-pipes-plugins/*/; do

.github/workflows/docker-snapshot.yml

@@ -108,7 +108,11 @@ jobs:
 
           mkdir -p "${OUT_DIR}/libs" "${OUT_DIR}/plugins" "${OUT_DIR}/config" "${OUT_DIR}/bin"
 
-          cp "tika-grpc/target/tika-grpc-${TIKA_VERSION}.jar" "${OUT_DIR}/libs/"
+          # The assembly zip contains the jar + lib/ (runtime deps referenced by MANIFEST.MF Class-Path)
+          unzip -q "tika-grpc/target/tika-grpc-${TIKA_VERSION}.zip" -d "${OUT_DIR}/libs_tmp"
+          cp "${OUT_DIR}/libs_tmp/tika-grpc-${TIKA_VERSION}.jar" "${OUT_DIR}/libs/"
+          cp -r "${OUT_DIR}/libs_tmp/lib" "${OUT_DIR}/libs/lib"
+          rm -rf "${OUT_DIR}/libs_tmp"
 
           # Copy tika-pipes plugin zip files
           for dir in tika-pipes/tika-pipes-plugins/*/; do