Modernise Dockerfile (kind-of)

Dockerfile

@@ -23,13 +23,17 @@ WORKDIR ${BUILD_DIR}
 RUN mix local.hex --force \
   && mix local.rebar --force
 
-COPY ./mix.exs ./mix.lock ./
-
-RUN mix deps.get --only ${MIX_ENV}
+RUN \
+  --mount=type=cache,target=./deps/,sharing=locked \
+  --mount=type=bind,source=./mix.exs,target=./mix.exs,readonly \
+  --mount=type=bind,source=./mix.lock,target=./mix.lock,readonly \
+  mix deps.get --only ${MIX_ENV}
 
 COPY . .
 
-RUN mkdir -p "${BUILD_DIR}_build/" \
+RUN \
+  --mount=type=cache,target=./deps/,sharing=locked \
+  mkdir -p "${BUILD_DIR}_build/" \
   && mix release --path "${BUILD_DIR}_build"
 
 

scripts/minify_icon_png.sh

@@ -1,3 +1,4 @@
 #!/usr/bin/env sh
-echo oxipng -v -o 3 -a -s -Z ./priv/static/icon-*.png ./priv/static/apple-touch-icon.png
+set -x
+
 oxipng -v -o 3 -a -s -Z ./priv/static/icon-*.png ./priv/static/apple-touch-icon.png

scripts/pack_favicon_ico.sh

@@ -1,7 +1,5 @@
 #!/usr/bin/env sh
+set -x
 
-echo "convert ./priv/static/favicon-16.png ./priv/static/favicon-32.png ./priv/static/favicon.ico \
-  && rm ./priv/static/favicon-16.png ./priv/static/favicon-32.png"
-
-convert ./priv/static/favicon-16.png ./priv/static/favicon-32.png ./priv/static/favicon.ico \
+magick ./priv/static/favicon-16.png ./priv/static/favicon-32.png ./priv/static/favicon.ico \
   && rm ./priv/static/favicon-16.png ./priv/static/favicon-32.png