Bug 1498019: [release] Build fennec on-push, on release branches; r=aki

These were originally built in the promotion phase because they are multi-l10n
builds and the L10n information wasn't stored in-tree. Now that the information
is in-tree, there is no reason to delay building them.

Differential Revision: https://phabricator.services.mozilla.com/D8305

--HG--
extra : moz-landing-system : lando

taskcluster/ci/build/android.yml

@@ -229,7 +229,7 @@ android-x86-nightly/opt:
     attributes:
         nightly: true
         enable-full-crashsymbols: true
-    shipping-phase: promote
+    shipping-phase: build
     shipping-product: fennec
     index:
         product: mobile
@@ -402,7 +402,7 @@ android-api-16-nightly/opt:
     attributes:
         nightly: true
         enable-full-crashsymbols: true
-    shipping-phase: promote
+    shipping-phase: build
     shipping-product: fennec
     index:
         product: mobile
@@ -521,7 +521,7 @@ android-aarch64-nightly/opt:
     attributes:
         nightly: true
         enable-full-crashsymbols: true
-    shipping-phase: promote
+    shipping-phase: build
     shipping-product: fennec
     index:
         product: mobile
@@ -640,7 +640,7 @@ android-x86_64-nightly/opt:
     attributes:
         nightly: true
         enable-full-crashsymbols: true
-    shipping-phase: promote
+    shipping-phase: build
     shipping-product: fennec
     index:
         product: mobile

taskcluster/taskgraph/target_tasks.py

@@ -62,8 +62,6 @@ def filter_beta_release_tasks(task, parameters, ignore_kinds=None, allow_l10n=Fa
             'win64-asan-reporter-nightly',
             ):
         return False
-    if str(platform).startswith('android') and 'nightly' in str(platform):
-        return False
 
     if platform in (
             'linux', 'linux64',