Rename x86_64-gnu-integration builder to x86_64-fuchsia

This better reflects what the builder actually does.

src/ci/docker/host-x86_64/x86_64-fuchsia/Dockerfile

@@ -72,4 +72,4 @@ ENV RUST_CONFIGURE_ARGS \
   --set target.x86_64-unknown-fuchsia.linker=/usr/local/bin/ld.lld
 ENV SCRIPT \
     python3 ../x.py install --target $TARGETS compiler/rustc library/std clippy && \
-    bash ../src/ci/docker/host-x86_64/x86_64-gnu-integration/build-fuchsia.sh
+    bash ../src/ci/docker/host-x86_64/x86_64-fuchsia/build-fuchsia.sh

src/ci/docker/host-x86_64/x86_64-fuchsia/build-fuchsia.sh

@@ -5,14 +5,14 @@
 #
 # You may run this script locally using Docker with the following command:
 #
-# $ src/ci/docker/run.sh x86_64-gnu-integration
+# $ src/ci/docker/run.sh x86_64-fuchsia
 #
 # Alternatively, from within the container with --dev, assuming you have made it
 # as far as building the toolchain with the above command:
 #
-# $ src/ci/docker/run.sh --dev x86_64-gnu-integration
+# $ src/ci/docker/run.sh --dev x86_64-fuchsia
 # docker# git config --global --add safe.directory /checkout/obj/fuchsia
-# docker# ../src/ci/docker/host-x86_64/x86_64-gnu-integration/build-fuchsia.sh
+# docker# ../src/ci/docker/host-x86_64/x86_64-fuchsia/build-fuchsia.sh
 #
 # Also see the docs in the rustc-dev-guide for more info:
 # https://github.com/rust-lang/rustc-dev-guide/pull/1989
@@ -21,7 +21,7 @@ set -euf -o pipefail
 
 # Set this variable to 1 to disable updating the Fuchsia checkout. This is
 # useful for making local changes. You can find the Fuchsia checkout in
-# `obj/x86_64-gnu-integration/fuchsia` in your local checkout after running this
+# `obj/x86_64-fuchsia/fuchsia` in your local checkout after running this
 # job for the first time.
 KEEP_CHECKOUT=
 

src/ci/github-actions/jobs.yml

@@ -208,6 +208,13 @@ auto:
   - image: test-various
     <<: *job-linux-4c
 
+  - image: x86_64-fuchsia
+    # Only run this job on the nightly channel. Fuchsia requires
+    # nightly features to compile, and this job would fail if
+    # executed on beta and stable.
+    only_on_channel: nightly
+    <<: *job-linux-8c
+
   - image: x86_64-gnu
     <<: *job-linux-4c
 
@@ -229,13 +236,6 @@ auto:
   - image: x86_64-gnu-aux
     <<: *job-linux-4c
 
-  - image: x86_64-gnu-integration
-    # Only run this job on the nightly channel. Fuchsia requires
-    # nightly features to compile, and this job would fail if
-    # executed on beta and stable.
-    only_on_channel: nightly
-    <<: *job-linux-8c
-
   - image: x86_64-gnu-debug
     <<: *job-linux-4c