New: Add goose to run migrations as an init container

Dockerfile

@@ -15,12 +15,18 @@ COPY . .
 # Build the application
 RUN go build -o shortener
 
+# Install goose migration tool
+RUN GOBIN=/app go install github.com/pressly/goose/v3/cmd/goose@latest
+
 FROM golang:1.26-bookworm AS runner
 
+WORKDIR /app
 COPY --from=base /app/shortener /app/shortener
+COPY --from=base /app/goose /app/goose
+COPY --from=base /app/sql/schema /app/sql/schema
 
 # Document the port that may need to be published
-EXPOSE 8000
+EXPOSE 8080
 
 # Start the application
 CMD ["/app/shortener"]