feat: add build script, upgrade to 1.2.4 dcli and dind to 20.10.3

ci-deadlock-cli/Dockerfile

-FROM docker:18.09.6-dind
+FROM docker:20.10.3-dind
 
 RUN apk add --update python3-dev py-pip gcc musl-dev maven
 RUN pip3 install --upgrade pip

ci-deadlock-cli/README.md

@@ -5,9 +5,5 @@ This Dockerfile installs deadlock-cli inside a docker-in-docker container
 # Steps to upgrade image
 
 ```bash
-$ NEW_VERSION=x.y
-$ docker build -t ci-deadlock-cli:$NEW_VERSION .
-$ docker tag ci-deadlock-cli:$NEW_VERSION registry.e-biz.fr/apuret/deadlock-public/ci-deadlock-cli:$NEW_VERSION
-$ docker login registry.e-biz.fr/apuret/deadlock-public/
-$ docker push registry.e-biz.fr/apuret/deadlock-public/ci-deadlock-cli:$NEW_VERSION
+> ./build.sh VERSION
 ```

ci-deadlock-cli/build.sh

+#!/bin/sh
+
+[ -z "$1" ] && echo "Version not specified" && exit 1;
+
+NEW_VERSION=$1
+docker build -t ci-deadlock-cli:$NEW_VERSION .
+docker tag ci-deadlock-cli:$NEW_VERSION registry.e-biz.fr/apuret/deadlock-public/ci-deadlock-cli:$NEW_VERSION
+docker login registry.e-biz.fr/apuret/deadlock-public/
+docker push registry.e-biz.fr/apuret/deadlock-public/ci-deadlock-cli:$NEW_VERSION
\ No newline at end of file