Improved the Docker image and build context for the Website service target.

.dockerignore

@@ -10,6 +10,9 @@
 **/.build
 **/.swiftpm
 
+# The test database's data directory.
+**/Tests/DB
+
 # Xcode project (not used by the Linux build)
 *.xcodeproj
 

Services/Website/Dockerfile

@@ -70,8 +70,9 @@ RUN swift build --package-path ./Services/Website -c release \
 # Switch to the staging area
 WORKDIR /staging
 
-# Copy main executable to staging area
-RUN cp "$(swift build --package-path /build/Services/Website -c release --show-bin-path)/Website" ./
+# Copy main executable to staging area, without its debug sections
+RUN cp "$(swift build --package-path /build/Services/Website -c release --show-bin-path)/Website" ./ \
+    && strip --strip-debug ./Website
 
 # Copy static swift backtracer binary to staging area
 RUN cp "/usr/libexec/swift/linux/swift-backtrace-static" ./