Lock image to alpine 3.17

`musl` in Alpine 3.18 has breaking changes in sharp. We need sharp 0.32.6, but Lemmy uses 0.32.4. And even if we changed sharp to 0.32.6, livips 8.15 is not available without Alpine edge.

This change to Alpine 3.17 will hopefully fix build issues

Dockerfile-frontend

@@ -9,17 +9,13 @@ RUN cd /app && \
   CGO_ENABLED=0 go build
 
 # Original Dockerfile below (mostly)
-FROM node:alpine as builder
-
-# Lemmy uses a bleeding edge version of vips, and the necessary version is only available in Alpine edge
-RUN echo "https://dl-cdn.alpinelinux.org/alpine/edge/main" > /etc/apk/repositories && \
-    echo "https://dl-cdn.alpinelinux.org/alpine/edge/community" >> /etc/apk/repositories
+FROM node:alpine3.17 as builder
 
 # Added vips-dev and pkgconfig so that local vips is used instead of prebuilt
 # Done for two reasons:
 # - libvips binaries are not available for ARM32
 # - It can break depending on the CPU (https://github.com/LemmyNet/lemmy-ui/issues/1566)
-RUN apk update && apk upgrade && apk add --no-cache curl yarn python3 build-base gcc wget git vips-dev pkgconfig
+RUN apk update && apk add --no-cache curl yarn python3 build-base gcc wget git vips-dev pkgconfig
 
 # Install node-gyp
 RUN npm install -g node-gyp
@@ -63,12 +59,8 @@ RUN rm -rf ./node_modules/npm
 
 RUN du -sh ./node_modules/* | sort -nr | grep '\dM.*'
 
-FROM node:alpine as runner
-# Lemmy uses a bleeding edge version of vips, and the necessary version is only available in Alpine edge
-RUN echo "https://dl-cdn.alpinelinux.org/alpine/edge/main" > /etc/apk/repositories && \
-    echo "https://dl-cdn.alpinelinux.org/alpine/edge/community" >> /etc/apk/repositories
-
-RUN apk update && apk upgrade && apk add vips-cpp
+FROM node:alpine3.17 as runner
+RUN apk add vips-cpp
 COPY --from=builder /usr/src/app/dist /app/dist
 COPY --from=builder /usr/src/app/node_modules /app/node_modules