packaging: debian package installation with post-install

[v1v]

What

• Configure the debian package installation with the post-install.sh script.
• Agent installed in the path /opt/elastic/apm-agent-php
• Use the official php-fpm docker image.
• Installation test script uses the installer rather than the hardcoded configuration.
• Support for different php versions by command line.
• Support packaging and smoke test installation in the CI for all the three PHP versions. (7.2, 7.3 and 7.4)

Test

$ PHP_VERSION=7.2 make -f .ci/Makefile build install
$ PHP_VERSION=7.2 make -C packaging deb deb-install

{:timestamp=>"2020-07-22T15:02:10.336693+0000", :message=>"Debian packaging tools generally labels all files in /etc as config files, as mandated by policy, so fpm defaults to this behavior for deb packages. You can disable this default behavior with --deb-no-default-config-files flag", :level=>:warn}
{:timestamp=>"2020-07-22T15:02:10.613323+0000", :message=>"Created package", :path=>"build/packages/apm-agent-php_0.1-preview_all.deb"}
Creating sha512sum ...
...
+ dpkg -i build/packages/apm-agent-php_0.1-preview_all.deb
Selecting previously unselected package apm-agent-php.
(Reading database ... 12741 files and directories currently installed.)
Preparing to unpack .../apm-agent-php_0.1-preview_all.deb ...
Unpacking apm-agent-php (0.1-preview) ...
Setting up apm-agent-php (0.1-preview) ...
Installing Elastic PHP agent
  Extension configuration has just been added for the Elastic PHP agent.
; THIS IS AN AUTO-GENERATED FILE by the Elastic PHP agent post-install.sh script
extension=/opt/elastic/apm-agent-php/extensions/elastic_apm.so
elastic_apm.bootstrap_php_part_file=/opt/elastic/apm-agent-php/src/bootstrap_php_part.php
; END OF AUTO-GENERATED
+ php -m
+ grep elastic
elastic_apm
+ composer install
...
Time: 5.27 seconds, Memory: 10.00 MB

OK (3 tests, 65 assertions)

[apmmachine]

💚 Build Succeeded

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Build stats

• Build Cause: [Pull request #98 updated]

• Start Time: 2020-07-22T15:28:52.117+0000

• Duration: 6 min 58 sec

Test stats 🧪

Test	Results
Failed	0
Passed	78
Skipped	0
Total	78