Bug 1693479 - Switch linux64-aarch64 build to using a sysroot. r=firefox-build-system-reviewers,andi,sheehan,mhentges

Let's start with this one, since it's not shipped. This allows to remove
the corresponding docker image that was only used for this job.

Differential Revision: https://phabricator.services.mozilla.com/D105597

taskcluster/ci/build/linux.yml

@@ -1373,7 +1373,6 @@ linux64-aarch64/opt:
         tier: 2
     worker-type: b-linux
     worker:
-        docker-image: {in-tree: debian10-arm64-build}
         max-run-time: 7200
     run:
         using: mozharness
@@ -1401,6 +1400,7 @@ linux64-aarch64/opt:
             - linux64-sccache
             - linux64-node
             - linux64-lucetc
+            - linux64-aarch64-sysroot
             - wasi-sysroot
     optimization:
         skip-unless-expanded: null

taskcluster/ci/docker-image/kind.yml

@@ -141,12 +141,6 @@ jobs:
         definition: debian-build
         args:
             ARCH: amd64
-    debian10-arm64-build:
-        symbol: I(deb10-arm64)
-        parent: debian10-base
-        definition: debian-build
-        args:
-            ARCH: arm64
     debian10-test-iris:
         symbol: I(deb10-ti)
         parent: debian10-test