Use cgo-free SQL driver and add limit of 100 to maxVoters

Dockerfile

@@ -0,0 +1,14 @@
+FROM golang:1.23-alpine
+
+RUN mkdir /qv
+ENV QV_DATABASE_PATH="/qv/qv.sqlite"
+
+WORKDIR /usr/src/qv
+
+COPY go.mod go.sum ./
+RUN go mod download && go mod verify
+
+COPY . .
+RUN go build -ldflags "-s -w" -v -o /usr/local/bin/qv ./cmd/web/
+
+CMD ["qv"]