Adds tools to bulk modify operator templating pull requests. (#26)

Author: soenkeliebau

bulk-pr/README.md

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+# PR Bulk Tools
+
+This contains a selection of scripts that can be used to bulk manipulate similar PRs across a defined set of repositories.
+The requirement for PRs to be considered _similar_ for the purpose of these scripts is that the branch they are created from have the same name.
+
+**WARNING:** 
+These scripts do not contain much in the way of safety checks or security confirmations.
+You are expected to know what you are doing and should most probably conduct due diligence directly on the PRs before using these tools to approve them.
+
+## Overview
+This section will give a brief overview of the tools contained in this repo.
+
+The recommended workflow for PRs created by the operator templating is:
+
+1. Run `pr_diff` and check for any unexpected changes
+2. Periodically run `pr_status` until all PRs show 0
+3. Run `pr_approve`
+
+### Common parameters
+With the only exception of the `repos` script all scripts in this repository take the same parameter, which is the name of the branch the PRs you want to operate on was created from.
+
+For example for a set of operator templating pull requests this will usually be in the form of `template_abd68ad` which is the fixed prefix `template_` followed by the short commit hash of the commit in the operator templating repo that it was based on.
+
+### Configuration
+Configuration of all these tools is done in the `repos` script. 
+This script doesn't take any parameters.
+It is sourced by all the other scripts and defines the list of operator repositories that should be included in bulk operations.
+
+Edit this file if you want to exclude operators from bulk operations for some reason, or if new operators have been created that should be included.
+
+## Scripts
+### pr_approve
+Approves all pull requests and adds a `bors r+` comment to start the bors merge process.
+
+### pr_checks
+Shows all checks for all PRs and their current status. 
+
+Checks are shown per PR, hitting `q` switches to the next PR, Ctrl-C can be used to abort the entire script.
+
+### pr_close
+Closes all PRs.
+
+### pr_diffs
+Shows the diffs for all PRs, this can be useful to double check that no unexpected changes were queued in any repository by accident.
+
+Diffs are shown per PR, hitting `q` switches to the next PR, Ctrl-C can be used to abort the entire script.
+
+### pr_status
+Shows an abbreviated status of all PRs.
+
+The displayed status per PR can have the following values:
+
+| Status | Meaning                                        | 
+|--------|------------------------------------------------|
+| 0      | All checks were finished and successful        | 
+| 1      | One or more checks failed or are still running | 

bulk-pr/pr_approve

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+#!/usr/bin/env bash
+source repos
+for product in "${products[@]}"; do
+  gh pr review $1 --approve -R stackabletech/${product}-operator
+  gh pr review $1 --comment -b "bors r+" -R stackabletech/${product}-operator
+done

bulk-pr/pr_checks

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+#!/usr/bin/env bash
+source repos
+for product in "${products[@]}"; do
+    gh pr checks $1 -R stackabletech/${product}-operator 
+done
+

bulk-pr/pr_close

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+#!/usr/bin/env bash
+source repos
+for product in "${products[@]}"; do
+    gh pr close $1 -R stackabletech/${product}-operator
+done

bulk-pr/pr_diffs

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+#!/usr/bin/env bash
+source repos
+for product in "${products[@]}"; do
+    gh pr diff $1 -R stackabletech/${product}-operator
+done
+

bulk-pr/pr_status

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+#!/usr/bin/env bash
+source repos
+for product in "${products[@]}"; do
+    gh pr checks $1 -R stackabletech/${product}-operator &> /dev/null
+    status=$?
+    echo ${product}: ${status}
+done
+

bulk-pr/repos

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+#!/usr/bin/env bash
+products=(
+    kafka
+    opa
+    regorule 
+    zookeeper
+    trino
+    druid
+    hive
+    hdfs
+    nifi
+    spark
+    superset
+    airflow
+    hbase
+)