Pull request: beta client squashed

Merge in DNS/adguard-home from beta-client-2 to master

Squashed commit of the following:

commit b2640cc49a6c5484d730b534dcf5a8013d7fa478
Merge: 659def862 aef4659e9
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Tue Dec 29 19:23:09 2020 +0300

    Merge branch 'master' into beta-client-2

commit 659def8626467949c35b7a6a0c99ffafb07b4385
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Tue Dec 29 17:25:14 2020 +0300

    all: upgrade github actions node version

commit b4b8cf8dd75672e9155da5d111ac66e8f5ba1535
Author: Vladislav Abdulmyanov <v.abdulmyanov@adguard.com>
Date:   Tue Dec 29 16:57:14 2020 +0300

    all: beta client squashed

.gitignore

@@ -7,9 +7,11 @@
 # Only build, run, and test outputs here.  Sorted.
 *-packr.go
 *.db
+*.log
 *.snap
 /bin/
 /build/
+/build2/
 /data/
 /dist/
 /dnsfilter/tests/dnsfilter.TestLotsOfRules*.pprof
@@ -19,4 +21,5 @@
 /snapcraft_login
 AdGuardHome*
 coverage.txt
+leases.db
 node_modules/