Don't create CI run if pull_request is from same repo

[emteknetnz]

In some scenarios a pull-request isn't created from a fork of the repo, instead it done from the same repo

Because there are both pull_request and push triggers on the jobs, two essentially identical CI jobs are run. While this has no real cost of open-source repos, on private repos it wastes github action credits

Acceptance criteria

• Detect if a pull request originates from a fork or the same repository.
• Prevent duplicate CI jobs by ignoring the push trigger for internal PRs.
• This logic is applied to all supported repos (i.e. use shared ci.yml or use module standardiser)

PRs

• ENH Add ci.php script module-standardiser#79

Module standariders PRs

• MNT Run module-standardiser silverstripe-siteconfig#190
• MNT Run module-standardiser silverstripe-reports#215
• MNT Run module-standardiser bringyourownideas/silverstripe-maintenance#256
• MNT Run module-standardiser bringyourownideas/silverstripe-composer-update-checker#101
• MNT Run module-standardiser silverstripe-gridfield-bulk-editing-tools#328
• MNT Run module-standardiser cwp-agencyextensions#140
• MNT Run module-standardiser cwp-starter-theme#274
• MNT Run module-standardiser cwp-watea-theme#206
• MNT Run module-standardiser silverstripe-elemental#1344
• MNT Run module-standardiser silverstripe-elemental-userforms#111
• MNT Run module-standardiser silverstripe-admin#1923
• MNT Run module-standardiser silverstripe-asset-admin#1559
• MNT Run module-standardiser silverstripe-assets#680
• MNT Run module-standardiser silverstripe-auditor#99
• MNT Run module-standardiser silverstripe-blog#813
• MNT Run module-standardiser silverstripe-campaign-admin#351
• MNT Run module-standardiser silverstripe-cms#3071
• MNT Run module-standardiser silverstripe-config#127
• MNT Run module-standardiser silverstripe-contentreview#277
• MNT Run module-standardiser silverstripe-crontask#102
• MNT Run module-standardiser silverstripe-documentconverter#107
• MNT Run module-standardiser silverstripe-elemental-bannerblock#175
• MNT Run module-standardiser silverstripe-elemental-fileblock#63
• MNT Run module-standardiser silverstripe-environmentcheck#126
• MNT Run module-standardiser silverstripe-errorpage#136
• MNT Run module-standardiser silverstripe-externallinks#161
• MNT Run module-standardiser silverstripe-framework#11670
• MNT Run module-standardiser silverstripe-graphql#629
• MNT Run module-standardiser silverstripe-gridfieldqueuedexport#136
• MNT Run module-standardiser silverstripe-hybridsessions#119
• MNT Run module-standardiser silverstripe-iframe#107
• MNT Run module-standardiser silverstripe-installer#389
• MNT Run module-standardiser silverstripe-ldap#103
• MNT Run module-standardiser silverstripe-linkfield#375
• MNT Run module-standardiser silverstripe-lumberjack#187
• MNT Run module-standardiser silverstripe-mimevalidator#88
• MNT Run module-standardiser silverstripe-realme#180
• MNT Run module-standardiser silverstripe-session-manager#244
• MNT Run module-standardiser recipe-authoring-tools#46
• MNT Run module-standardiser recipe-blog#64
• MNT Run module-standardiser recipe-cms#97
• MNT Run module-standardiser recipe-collaboration#42
• MNT Run module-standardiser recipe-content-blocks#56
• MNT Run module-standardiser recipe-core#107
• MNT Run module-standardiser recipe-form-building#45
• MNT Run module-standardiser recipe-plugin#52
• MNT Run module-standardiser recipe-reporting-tools#54
• MNT Run module-standardiser recipe-services#45
• MNT Run module-standardiser recipe-kitchen-sink#91
• MNT Run module-standardiser silverstripe-registry#119
• MNT Run module-standardiser silverstripe-restfulserver#143
• MNT Run module-standardiser silverstripe-securityreport#93
• MNT Run module-standardiser silverstripe-segment-field#132
• MNT Run module-standardiser silverstripe-sharedraftcontent#282
• MNT Run module-standardiser silverstripe-siteconfig#193
• MNT Run module-standardiser silverstripe-sitewidecontent-report#115
• MNT Run module-standardiser silverstripe-spamprotection#134
• MNT Run module-standardiser silverstripe-staticpublishqueue#222
• MNT Run module-standardiser silverstripe-subsites#636
• MNT Run module-standardiser silverstripe-tagfield#322
• MNT Run module-standardiser silverstripe-taxonomy#130
• MNT Run module-standardiser silverstripe-textextraction#108
• MNT Run module-standardiser silverstripe-userforms#1381
• MNT Run module-standardiser vendor-plugin#93
• MNT Run module-standardiser silverstripe-versioned#499
• MNT Run module-standardiser silverstripe-versioned-admin#394
• MNT Run module-standardiser silverstripe-versionfeed#128
• MNT Run module-standardiser silverstripe-simple#88
• MNT Run module-standardiser silverstripe-advancedworkflow#573
• MNT Run module-standardiser silverstripe-gridfieldextensions#434
• MNT Run module-standardiser symbiote/silverstripe-multivaluefield#125
• MNT Run module-standardiser silverstripe-queuedjobs#463
• MNT Run module-standardiser tractorcow-farm/silverstripe-fluent#949
• MNT Run module-standardiser silverstripe-mfa#601
• MNT Run module-standardiser silverstripe-totp-authenticator#195
• MNT Run module-standardiser silverstripe-webauthn-authenticator#208
• MNT Run module-standardiser silverstripe-login-forms#209
• MNT Run module-standardiser silverstripe-dynamodb#74
• MNT Run module-standardiser gha-action-ci#20
• MNT Run module-standardiser gha-auto-tag#27
• MNT Run module-standardiser gha-dispatch-ci#22
• MNT Run module-standardiser gha-issue#18
• MNT Run module-standardiser gha-merge-up#54
• MNT Run module-standardiser gha-run-tests#46
• MNT Run module-standardiser recipe-testing#33
• MNT Run module-standardiser silverstripe-behat-extension#303
• MNT Run module-standardiser cow#264
• MNT Run module-standardiser markdown-php-codesniffer#20
• MNT Run module-standardiser silverstripe-standards#19
• MNT Run module-standardiser documentation-lint#21
• MNT Run module-standardiser supported-modules#61
• MNT Run module-standardiser webpack-config#83
• MNT Run module-standardiser api.silverstripe.org#138
• MNT Run module-standardiser silverstripe-userhelp-content#187
• MNT Run module-standardiser doorman#52
• MNT Run module-standardiser silverstripe-htmleditor-tinymce#10
• MNT Run module-standardiser silverstripe-template-engine#12