GitIgnore fixes, DockerFile fixes

PosterMaker.Core/Dockerfile

@@ -1,20 +1,29 @@
-FROM mcr.microsoft.com/dotnet/sdk:7.0 AS build
-WORKDIR /build
+# Stage 1: Build
+FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build
+WORKDIR /src
+
+# Copy the project file and restore dependencies
+COPY PosterMaker.Core.csproj .
+RUN dotnet restore PosterMaker.Core.csproj
+
+# Copy the entire source code and build it
+COPY . .
+RUN dotnet build PosterMaker.Core.csproj -c Release -o /app/build
+
+# Stage 2: Publish
+FROM build AS publish
+RUN dotnet publish PosterMaker.Core.csproj -c Release -o /app/publish
+
+# Stage 3: Final
+FROM mcr.microsoft.com/dotnet/aspnet:7.0 AS final
+WORKDIR /app
+
+# Set environment variables and expose port
 ENV ASPNETCORE_URLS=http://+:80
 EXPOSE 80
 
-FROM mcr.microsoft.com/dotnet/sdk:7.0 AS build
-WORKDIR /src
-COPY ["PosterMaker.Core/PosterMaker.Core.csproj", "PosterMaker.Core/"]
-RUN dotnet restore "PosterMaker.Core/PosterMaker.Core.csproj"
-COPY . .
-WORKDIR "/src/PosterMaker.Core"
-RUN dotnet build "PosterMaker.Core.csproj" -c Release -o /app/build
-
-FROM build AS publish
-RUN dotnet publish "PosterMaker.Core.csproj" -c Release -o /app/publish
-
-FROM base AS final
-WORKDIR /app
+# Copy the published app from the publish stage
 COPY --from=publish /app/publish .
-ENTRYPOINT ["dotnet", "PosterMaker.Core.dll"]
+
+# Set the entrypoint
+ENTRYPOINT ["dotnet", "PosterMaker.Core.dll"]