ci: format all YAML with `yq`

`yq` is the YAML query tool, used for manipulating YAML files. This
change uses the following command to read in and to pretty-print every
YAML file in this repository:

    for x in $(find . -name '*.yaml'); do
        yq -i -P -oy $x
    done

This makes it a bit easier to automate synchronisation between staging
and upstream, as yq always pretty-prints the entire document when
manipulating files.

Signed-off-by: Chris Kay <chris.kay@arm.com>
Change-Id: If973766fa26500d5320612422d1b4999b23439d3
diff --git a/tf-a-lts-cleanup.yaml b/tf-a-lts-cleanup.yaml
index 7e44c2f..79c9a17 100644
--- a/tf-a-lts-cleanup.yaml
+++ b/tf-a-lts-cleanup.yaml
@@ -6,28 +6,28 @@
     disabled: false
     description: Cleanup stale LTS sandbox tags/branches
     properties:
-    - build-discarder:
-        days-to-keep: 180
-        num-to-keep: 30
+      - build-discarder:
+          days-to-keep: 180
+          num-to-keep: 30
     triggers:
-        - timed: 'H 3 * * 0,3'
+      - timed: H 3 * * 0,3
     wrappers:
-        - credentials-binding:
+      - credentials-binding:
           - ssh-user-private-key:
               credential-id: TFA_CI_BOT_USER_SSH_KEY
               key-file-variable: CI_BOT_KEY
               username-variable: CI_BOT_USERNAME
-              passphrase-variable: ''
-        - timestamps
+              passphrase-variable: ""
+      - timestamps
     builders:
-        - shell: |
-            #!/bin/bash
-            set -ex
+      - shell: |
+          #!/bin/bash
+          set -ex
 
-            mkdir -p ~/.ssh/
-            ssh-keyscan -p 29418 review.trustedfirmware.org >> ~/.ssh/known_hosts
-            export GIT_SSH_COMMAND="ssh -i $CI_BOT_KEY -o 'PubkeyAcceptedKeyTypes +ssh-rsa'"
+          mkdir -p ~/.ssh/
+          ssh-keyscan -p 29418 review.trustedfirmware.org >> ~/.ssh/known_hosts
+          export GIT_SSH_COMMAND="ssh -i $CI_BOT_KEY -o 'PubkeyAcceptedKeyTypes +ssh-rsa'"
 
-            git clone https://git.trustedfirmware.org/ci/tf-a-ci-scripts.git
-            cd tf-a-ci-scripts/lts
-            ./lts-cleanup-sandbox-refs.py --user $CI_BOT_USERNAME --limit 1
+          git clone https://git.trustedfirmware.org/ci/tf-a-ci-scripts.git
+          cd tf-a-ci-scripts/lts
+          ./lts-cleanup-sandbox-refs.py --user $CI_BOT_USERNAME --limit 1