Bug 1401620 - Snap: Update docker image so it can run git

releasetasks/templates/desktop/snap.yml.tmpl

@@ -27,7 +27,7 @@
 
         payload:
             maxRunTime: 7200
-            image: mozillareleases/firefox-snapcraft@sha256:ddd9e7fd38418e9e545a7e284dc3c3a164cdc8e8b4418b1b3c7b1916adfd3400
+            image: mozillareleases/firefox-snapcraft@sha256:107cc7a89d45ce6df30f44fe0dfd0b375b3ab443b75e92efc77c4f7bc5da8717
             artifacts:
                 public/build:
                     path: /home/worker/artifacts/
@@ -37,8 +37,9 @@
                 - /bin/bash
                 - -cx
                 - >
+                  apt-get update && apt-get dist-upgrade -y &&
                   curl -o scripts.tar.bz2 https://hg.mozilla.org/{{ repo_path }}/archive/{{ mozharness_changeset }}.tar.bz2/taskcluster/docker/firefox-snap/ &&
-                  mkdir scripts && tar xvfj scripts.tar.bz2 -C scripts --strip-components 4 && cd scripts && apt-get update && apt-get dist-upgrade -y &&
+                  mkdir scripts && tar xvfj scripts.tar.bz2 -C scripts --strip-components 4 && cd scripts &&
                   ./runme.sh
             env:
                 VERSION: "{{ version }}"