Added docker file

Author: JohilAngelo22

Dockerfile

@@ -0,0 +1,22 @@
+# Use the official .NET SDK image for building and running tests
+FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build
+
+WORKDIR /app
+
+# Copy csproj and restore as distinct layers
+COPY *.sln .
+COPY playwright-csharp-ui-tests/*.csproj ./playwright-csharp-ui-tests/
+RUN dotnet restore
+
+# Copy the rest of the source code
+COPY playwright-csharp-ui-tests/. ./playwright-csharp-ui-tests/
+
+WORKDIR /app/playwright-csharp-ui-tests
+
+# Install Playwright browsers
+RUN dotnet tool install --global Microsoft.Playwright.CLI \
+    && export PATH="$PATH:/root/.dotnet/tools" \
+    && playwright install
+
+# Build and run tests
+ENTRYPOINT ["dotnet", "test"]