fix: follow hadolint hints

Follow hadolint best practices in order to have a docker build that is as reliable as possible.

- first best practice is to "Pin versions in apk add. Instead of `apk add <package>` use `apk add <package>=<version>`" (see [DL3018](https://github.com/hadolint/hadolint/wiki/DL3018))
- second best practice is to use "`--no-cache` switch to avoid the need to use `--update`"

Dockerfile

@@ -19,8 +19,24 @@ COPY . /home/lutim
 RUN chmod -R g+rwX /home/lutim
 
 WORKDIR /home/lutim
-RUN apk --update add perl libpq perl-crypt-rijndael perl-io-socket-ssl perl-net-ssleay su-exec shared-mime-info libretls imagemagick imagemagick-perlmagick \
- && apk --update add --virtual .build-deps build-base perl-utils perl-dev postgresql14-dev vim wget zlib-dev \
+RUN apk --no-cache add perl~=5 \
+                       libpq~=14 \
+                       perl-crypt-rijndael~=1 \
+                       perl-io-socket-ssl~=2 \
+                       perl-net-ssleay~=1 \
+                       su-exec~=0.2 \
+                       shared-mime-info~=2 \
+                       libretls~=3 \
+                       imagemagick~=7 \
+                       imagemagick-perlmagick~=7 \
+                       bash~=~5 \
+ && apk --no-cache add --virtual .build-deps build-base~=0.5 \
+                                             perl-utils~=5 \
+                                             perl-dev~=5 \
+                                             postgresql14-dev~=14 \
+                                             vim~=8 \
+                                             wget~=1 \
+                                             zlib-dev~=1 \
  && cpan notest Carton Config::FromHash \
  && carton install --without test \
  && apk del .build-deps \

docker/entrypoint.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 set -eu
 
@@ -14,7 +14,7 @@ then
     echo ""
     echo "You can then install the build dependencies with this command"
     echo "    sh ~lutim/docker/install-dev-env.sh"
-    
+
     tail -f /dev/null
     exit 0
 fi
@@ -28,7 +28,7 @@ then
     DB_HOST=$(perl utilities/read_conf.pl pgdb/host db)
     DB_PORT=$(perl utilities/read_conf.pl pgdb/port 5432)
 fi
-if [ -n "$DB_HOST" -a -n "$DB_PORT" ]
+if [ -n "$DB_HOST" ] && [ -n "$DB_PORT" ]
 then
     while ! nc -vz "${DB_HOST}" "${DB_PORT}"; do
         echo "Waiting for database..."