Builds will fail on s390x, i386 and ppc64el because we depend on nodejs, which is only published for armhf, arm64 and amd64. This change merely tells the snap build farm to not waste time trying to build on architectures will will guarantee failure. Apologies for overlooking this in our previous PR.

Example build failures can be seen at [i386](https://launchpad.net/~build.snapcraft.io/+snap/53d5570c233b8b3663242f8d94dc21ad/+build/945935), [ppc64el](https://launchpad.net/~build.snapcraft.io/+snap/53d5570c233b8b3663242f8d94dc21ad/+build/945939), [s390x](https://launchpad.net/~build.snapcraft.io/+snap/53d5570c233b8b3663242f8d94dc21ad/+build/945940)

Removing some of the complexity, together with the install and
configure hook.

Signed-off-by: Sergio Schvezov <sergio.schvezov@canonical.com>

* Remove more explicit 'generate' calls

`generate` is now implicit during `build` since #9114, it is no longer
necessary or desired to specify it explicitely.

* add js,css,generate dependencies to release task

* remove generate warning as per @lunny

* use vfsgen instead of go-bindata

* fix templates

* fix fmt

* vendor vsfgen

* Modify tbraeutigam/gogs-snap for gitea

* Fix building on 16.04 (manually build go-bindata).
-> add _source.tar.bz2 to .gitignore (used by snapcraft cleanbuild)

* Streamline Snap packaging:
 - Take advantage of install-hooks (snapd 2.27)
 - Use snapctl configuration storage for unchanging values

* Move to using Snap Hooks for configuration

* Missed re-adding daemon statement

* Fix two warnings from Codacy.