Use more generic docker deps. Fixes #1759

docker/dev/Dockerfile

@@ -45,7 +45,7 @@ RUN strip ./target/$CARGO_BUILD_TARGET/$RUSTRELEASEDIR/lemmy_server
 RUN cp ./target/$CARGO_BUILD_TARGET/$RUSTRELEASEDIR/lemmy_server /app/lemmy_server
 
 # The alpine runner
-FROM alpine:3.14 as lemmy
+FROM alpine:3 as lemmy
 
 # Install libpq for postgres
 RUN apk add libpq

docker/dev/volume_mount.dockerfile

@@ -1,7 +1,7 @@
 # syntax=docker/dockerfile:experimental
 
 # Warning: this will not pick up migrations unless there are code changes
-FROM rust:1.51-buster as rust
+FROM rust:1-slim as rust
 
 ENV HOME=/home/root
 
@@ -18,7 +18,7 @@ RUN --mount=type=cache,target=/usr/local/cargo/registry \
 RUN --mount=type=cache,target=/app/target \
     cp target/debug/lemmy_server lemmy_server
 
-FROM ubuntu:20.10
+FROM ubuntu:20.04
 
 # Install libpq for postgres
 RUN apt-get update -y

docker/federation/docker-compose.yml

@@ -2,7 +2,7 @@ version: '3.3'
 
 services:
   nginx:
-    image: nginx:1.17-alpine
+    image: nginx:1-alpine
     ports:
       - "8540:8540"
       - "8550:8550"

docker/prod/Dockerfile

@@ -18,7 +18,7 @@ RUN strip ./target/$CARGO_BUILD_TARGET/$RUSTRELEASEDIR/lemmy_server
 RUN cp ./target/$CARGO_BUILD_TARGET/$RUSTRELEASEDIR/lemmy_server /app/lemmy_server
 
 # The alpine runner
-FROM alpine:3.14 as lemmy
+FROM alpine:3 as lemmy
 
 # Install libpq for postgres
 RUN apk add libpq

docker/prod/Dockerfile.arm

@@ -1,4 +1,4 @@
-ARG RUST_BUILDER_IMAGE=rust:1.51.0-slim-buster
+ARG RUST_BUILDER_IMAGE=rust:1-slim
 
 # Build Lemmy
 FROM $RUST_BUILDER_IMAGE as builder