ci: cache native image build dependencies

server/Dockerfile

@@ -3,11 +3,18 @@ WORKDIR /src
 RUN apt-get update \
     && apt-get install -y --no-install-recommends clang zlib1g-dev \
     && rm -rf /var/lib/apt/lists/*
+COPY server/Directory.Build.props ./server/
+COPY server/src/WebDrop.Api/WebDrop.Api.csproj ./server/src/WebDrop.Api/
+COPY server/src/WebDrop.Core/WebDrop.Core.csproj ./server/src/WebDrop.Core/
+COPY server/src/WebDrop.Storage/WebDrop.Storage.csproj ./server/src/WebDrop.Storage/
+RUN dotnet restore server/src/WebDrop.Api/WebDrop.Api.csproj \
+    --runtime linux-x64
 COPY server/ ./server/
 RUN dotnet publish server/src/WebDrop.Api/WebDrop.Api.csproj \
     --configuration Release \
     --runtime linux-x64 \
     --self-contained true \
+    --no-restore \
     --output /out
 RUN find /root/.nuget/packages/sqlitepclraw.lib.e_sqlite3 -path '*/runtimes/linux-x64/native/libe_sqlite3.so' \
     -exec cp {} /out/libe_sqlite3.so \; \