chore(deps): pin dependencies (#1)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.25-alpine3.22 AS builder
+FROM golang:1.25-alpine3.22@sha256:d3f0cf7723f3429e3f9ed846243970b20a2de7bae6a5b66fc5914e228d831bbb AS builder
 
 WORKDIR /app
 COPY go.* ./
@@ -7,7 +7,7 @@ RUN go mod download
 COPY . .
 RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o lightsout .
 
-FROM alpine:3.22
+FROM alpine:3.22@sha256:4b7ce07002c69e8f3d704a9c5d6fd3053be500b7f1c69fc0d80990c2ad8dd412
 RUN apk --no-cache add ca-certificates curl docker-cli
 WORKDIR /root/