chore: also use node 22 in docker

Dockerfile

@@ -1,4 +1,4 @@
-FROM node:20-slim as builder
+FROM node:22-slim as builder
 
 WORKDIR /usr/src/app
 
@@ -7,14 +7,14 @@ COPY ./yarn.lock ./
 COPY ./.yarnrc.yml ./
 
 RUN corepack enable
-RUN yarn install --immutable
+RUN --mount=type=cache,target=/root/.yarn YARN_CACHE_FOLDER=/root/.yarn yarn install --immutable
 
 COPY tsconfig.json .
 COPY src/ ./src/
 
 RUN yarn build
 
-FROM node:20-slim
+FROM node:22-slim
 
 WORKDIR /usr/src/app
 
@@ -23,7 +23,8 @@ COPY ./yarn.lock ./
 COPY ./.yarnrc.yml ./
 
 RUN corepack enable
-RUN yarn install --immutable
+# hadolint ignore=DL3060
+RUN --mount=type=cache,target=/root/.yarn YARN_CACHE_FOLDER=/root/.yarn yarn install --immutable
 
 COPY --from=builder /usr/src/app/build/ ./build/