Install rsvg-convert on docker images (#4230) (#4282)

In #4103 alpine was updated from 3.16 to 3.18, but in 3.17 librsvg
packages was splitted and rsvg-convert is on his own package.

docker/Dockerfile

@@ -33,7 +33,7 @@ RUN if [[ "${release}" == 1 ]] ; then \
     fi
 
 FROM alpine:3.18
-RUN apk add --no-cache librsvg ttf-opensans tini
+RUN apk add --no-cache rsvg-convert ttf-opensans tini
 WORKDIR /invidious
 RUN addgroup -g 1000 -S invidious && \
     adduser -u 1000 -S invidious -G invidious

docker/Dockerfile.arm64

@@ -33,7 +33,7 @@ RUN if [[ "${release}" == 1 ]] ; then \
     fi
 
 FROM alpine:3.18
-RUN apk add --no-cache librsvg ttf-opensans tini
+RUN apk add --no-cache rsvg-convert ttf-opensans tini
 WORKDIR /invidious
 RUN addgroup -g 1000 -S invidious && \
     adduser -u 1000 -S invidious -G invidious