add initial dev task template for working on a security issue

.gitlab/issue_templates/Security Developer Workflow.md

+<!--
+# Read me first!
+
+Create this issue under https://dev.gitlab.org/gitlab/gitlabhq
+
+Set the title to: `[Security] Description of the original issue`
+-->
+
+### Prior to the security release
+
+- [ ] Read the [security process for developers] if you are not familiar with it.
+- [ ] Link to the original issue adding it to the [links section](#links)
+- [ ] Run `scripts/security-harness` in the CE, EE, and/or Omnibus to prevent pushing to any remote besides `dev.gitlab.org`
+- [ ] Create an MR targetting `org` `master`, prefixing your branch with `security-`
+- [ ] Label your MR with the ~security label, prefix the title with `WIP: [master]`   
+- [ ] Add a link to the MR to the [links section](#links)
+- [ ] Add a link to an EE MR if required
+- [ ] Make sure the MR remains in-progress and gets approved after the review cycle, **but never merged**.
+- [ ] Assign the MR to a RM once is reviewed and ready to be merged. Check the [RM list] to see who to ping.
+
+#### Backports
+
+- [ ] Once the MR is ready to be merged, create MRs targetting the last 3 releases
+    - [ ] At this point, it might be easy to squash the commits from the MR into one
+    - You can use the script `bin/secpick` instead of the following steps, to help you cherry-picking. See the [seckpick documentation]
+    - [ ] Create the branch `security-X-Y` from `X-Y-stable` if it doesn't exist (and make sure it's up to date with stable)
+    - [ ] Create each MR targetting the security branch `security-X-Y`
+    - [ ] Add the ~security label and prefix with the version `WIP: [X.Y]` the title of the MR
+- [ ] Make sure all MRs have a link in the [links section](#links) and are assigned to a Release Manager.
+
+[seckpick documentation]: https://gitlab.com/gitlab-org/release/docs/blob/master/general/security/process.md#secpick-script
+
+#### Documentation and final details
+
+- [ ] Check the topic on #security to see when the next release is going ot happen and add a link to the [links section](#links)
+- [ ] Find out the versions affected (the Git history of the files affected may help you with this) and add them to the [details section](#details)
+- [ ] Fill in any upgrade notes that users may need to take into account in the [details section](#details)
+- [ ] Add Yes/No and further details if needed to the migration and settings columns in the [details section](#details)
+
+### Summary
+#### Links
+
+| Description | Link |
+| -------- | -------- |
+| Original issue   | #TODO  |
+| Security release issue   | #TODO  |
+| `master` MR | !TODO   |
+| `master` MR (EE) | !TODO   |
+| `Backport X.Y` MR | !TODO   |
+| `Backport X.Y` MR | !TODO   |
+| `Backport X.Y` MR | !TODO   |
+| `Backport X.Y` MR (EE) | !TODO   |
+| `Backport X.Y` MR (EE) | !TODO   |
+| `Backport X.Y` MR (EE) | !TODO   |
+
+#### Details
+
+| Description | Details | Further details|
+| -------- | -------- | -------- |
+| Versions affected | X.Y  | |
+| Upgrade notes | | |
+| GitLab Settings updated | Yes/No| |
+| Migration required | Yes/No | |
+
+[security process for developers]: https://gitlab.com/gitlab-org/release/docs/blob/master/general/security/process.md
+[RM list]:  https://about.gitlab.com/release-managers/
+
+/label ~security 

bin/secpick

+#!/usr/bin/env ruby
+require 'optparse'
+require 'open3'
+require 'rainbow/refinement'
+using Rainbow
+
+BRANCH_PREFIX = 'security'.freeze
+STABLE_BRANCH_SUFFIX = 'stable'.freeze
+REMOTE = 'dev'.freeze
+
+options = { version: nil, branch: nil, sha: nil }
+
+parser = OptionParser.new do |opts|
+  opts.banner = "Usage: #{$0} [options]"
+  opts.on('-v', '--version 10.0', 'Version') do |version|
+    options[:version] = version&.tr('.', '-')
+  end
+
+  opts.on('-b', '--branch security-fix-branch', 'Original branch name') do |branch|
+    options[:branch] = branch
+  end
+
+  opts.on('-s', '--sha abcd', 'SHA to cherry pick') do |sha|
+    options[:sha] = sha
+  end
+
+  opts.on('-h', '--help', 'Displays Help') do
+    puts opts
+
+    exit
+  end
+end
+
+parser.parse!
+
+abort("Missing options. Use #{$0} --help to see the list of options available".red) if options.values.include?(nil)
+abort("Wrong version format #{options[:version].bold}".red) unless options[:version] =~ /\A\d*\-\d*\Z/
+
+branch = [BRANCH_PREFIX, options[:branch], options[:version]].join('-').freeze
+stable_branch = "#{options[:version]}-#{STABLE_BRANCH_SUFFIX}".freeze
+
+command = "git checkout #{stable_branch} && git pull #{REMOTE} #{stable_branch} && git checkout -B #{branch} && git cherry-pick #{options[:sha]} && git push #{REMOTE} #{branch}"
+
+_stdin, stdout, stderr = Open3.popen3(command)
+
+puts stdout.read&.green
+puts stderr.read&.red