Add snippets to ease the archival of existing tasks

Related T1071

ardumont/archive-completed-oneshot-and-disabled-recurring.sh

+#!/usr/bin/env bash
+
+for y in {2016..2018}; do
+    for m in {1..12}; do
+        m_1=$((m + 1))
+
+        if [ ${m_1} -gt 12 ]; then
+            y_1=$((y + 1))
+            m_1=1
+        else
+            y_1=$y
+        fi
+
+        if [ $m -lt 10 ]; then
+            m="0${m}"
+        fi
+
+        if [ $m_1 -lt 10 ]; then
+            m_1="0${m_1}"
+        fi
+
+        cmd="python3 -m swh.scheduler.cli task archive --after "${y}-${m}-01" --before "${y_1}-${m_1}-01" --verbose --bulk-index 10"
+        echo $cmd
+        $cmd
+    done
+done

[Phabricator Migration user]

Some references in the commit message have been migrated:

• T1071 is now swh-scheduler#1071 (closed)