docker: merged lines to avoid useless layers

[janbogdanski]

Hey,
Not a game changer but always some MBs saved, each RUN creates layer which occupies space, eg. wget creates file - this is one layer which is always fetched, even this file is removed later. Doing all the cleanings in one RUN makes layers a little bit smaller

After modification
IMAGE          CREATED          CREATED BY                                      SIZE      COMMENT
a1ff72bea407   20 minutes ago   CMD ["apache2-foreground"]                      0B        buildkit.dockerfile.v0
<missing>      20 minutes ago   USER www-data                                   0B        buildkit.dockerfile.v0
<missing>      20 minutes ago   VOLUME [/var/www/filegator/private]             0B        buildkit.dockerfile.v0
<missing>      20 minutes ago   VOLUME [/var/www/filegator/repository]          0B        buildkit.dockerfile.v0
<missing>      20 minutes ago   EXPOSE map[8080/tcp:{}]                         0B        buildkit.dockerfile.v0
<missing>      20 minutes ago   RUN /bin/sh -c sed -ri -e 's!/var/www/html!$…   9.14kB    buildkit.dockerfile.v0
<missing>      20 minutes ago   ENV APACHE_PORT=8080                            0B        buildkit.dockerfile.v0
<missing>      20 minutes ago   ENV APACHE_DOCUMENT_ROOT=/var/www/filegator/…   0B        buildkit.dockerfile.v0
<missing>      20 minutes ago   RUN /bin/sh -c wget https://github.com/fileg…   12.7MB    buildkit.dockerfile.v0
<missing>      20 minutes ago   WORKDIR /var/www/filegator/                     0B        buildkit.dockerfile.v0
<missing>      20 minutes ago   RUN /bin/sh -c apt-get update > /dev/null &&…   57.1MB    buildkit.dockerfile.v0

Original
$ docker history 60ae5728ce0d
IMAGE          CREATED              CREATED BY                                      SIZE      COMMENT
60ae5728ce0d   About a minute ago   CMD ["apache2-foreground"]                      0B        buildkit.dockerfile.v0
<missing>      About a minute ago   USER www-data                                   0B        buildkit.dockerfile.v0
<missing>      About a minute ago   VOLUME [/var/www/filegator/private]             0B        buildkit.dockerfile.v0
<missing>      About a minute ago   VOLUME [/var/www/filegator/repository]          0B        buildkit.dockerfile.v0
<missing>      About a minute ago   EXPOSE map[8080/tcp:{}]                         0B        buildkit.dockerfile.v0
<missing>      About a minute ago   RUN /bin/sh -c a2enmod rewrite # buildkit       0B        buildkit.dockerfile.v0
<missing>      About a minute ago   RUN /bin/sh -c sed -ri -e 's!80!${APACHE_POR…   1.35kB    buildkit.dockerfile.v0
<missing>      About a minute ago   RUN /bin/sh -c sed -ri -e 's!80!${APACHE_POR…   332B      buildkit.dockerfile.v0
<missing>      About a minute ago   RUN /bin/sh -c sed -ri -e 's!/var/www/!${APA…   7.46kB    buildkit.dockerfile.v0
<missing>      About a minute ago   RUN /bin/sh -c sed -ri -e 's!/var/www/html!$…   1.34kB    buildkit.dockerfile.v0
<missing>      About a minute ago   ENV APACHE_PORT=8080                            0B        buildkit.dockerfile.v0
<missing>      About a minute ago   ENV APACHE_DOCUMENT_ROOT=/var/www/filegator/…   0B        buildkit.dockerfile.v0
<missing>      About a minute ago   RUN /bin/sh -c chmod -R g+w repository/ # bu…   0B        buildkit.dockerfile.v0
<missing>      About a minute ago   RUN /bin/sh -c chmod -R g+w private/ # build…   367B      buildkit.dockerfile.v0
<missing>      About a minute ago   WORKDIR /var/www/filegator/                     0B        buildkit.dockerfile.v0
<missing>      About a minute ago   RUN /bin/sh -c chown -R www-data:www-data /v…   12.7MB    buildkit.dockerfile.v0
<missing>      About a minute ago   RUN /bin/sh -c rm filegator_latest.zip # bui…   0B        buildkit.dockerfile.v0
<missing>      About a minute ago   RUN /bin/sh -c unzip filegator_latest.zip -d…   12.7MB    buildkit.dockerfile.v0
<missing>      About a minute ago   RUN /bin/sh -c wget https://github.com/fileg…   4.06MB    buildkit.dockerfile.v0
<missing>      About a minute ago   RUN /bin/sh -c docker-php-ext-enable zip # b…   0B        buildkit.dockerfile.v0
<missing>      About a minute ago   RUN /bin/sh -c docker-php-ext-install zip # …   72.9kB    buildkit.dockerfile.v0
<missing>      About a minute ago   RUN /bin/sh -c apt-get install -y git libzip…   38.9MB    buildkit.dockerfile.v0
<missing>      About a minute ago   RUN /bin/sh -c apt-get update > /dev/null # …   18.2MB    buildkit.dockerfile.v0