Allow Taskcluster to run on dev- branches; add Treeherder symbols f…

…or decision and action tasks (mozilla#120)

* Enable dev branches; add treeherder symbols for non-level 3 decision/action tasks.

* Drop base ref/rev to make pushes to non-main branches work

* Don't add treeherder symbols for pull requests (treeherder doesn't work for them anyways...)

* Use isPullRequest to determine whether or not something is a pull request for the purpose of skipping treeherder routes

* Only build dev- branches for staging repository

.taskcluster.yml

@@ -37,22 +37,11 @@ tasks:
                   'tasks_for == "github-push"': ${event.ref}
                   'tasks_for == "github-release"': '${event.release.target_commitish}'
                   'tasks_for in ["action", "cron"]': '${push.branch}'
-          base_ref:
-              $switch:
-                  'tasks_for[:19] == "github-pull-request"': ${event.pull_request.base.ref}
-                  'tasks_for == "github-push" && event.base_ref': ${event.base_ref}
-                  'tasks_for == "github-push"': ${event.ref}
-                  'tasks_for in ["cron", "action"]': '${push.branch}'
           head_ref:
               $switch:
                   'tasks_for[:19] == "github-pull-request"': ${event.pull_request.head.ref}
                   'tasks_for == "github-push"': ${event.ref}
                   'tasks_for in ["cron", "action"]': '${push.branch}'
-          base_sha:
-              $switch:
-                  'tasks_for == "github-push"': '${event.before}'
-                  'tasks_for[:19] == "github-pull-request"': '${event.pull_request.base.sha}'
-                  'tasks_for in ["cron", "action"]': '${push.revision}'
           head_sha:
               $switch:
                   'tasks_for == "github-push"': '${event.after}'
@@ -71,7 +60,7 @@ tasks:
       in:
           $if: >
               tasks_for in ["action", "cron"]
-              || (tasks_for == "github-push" && head_branch == "refs/heads/main")
+              || (tasks_for == "github-push" && (head_branch == "refs/heads/main" || (repoUrl == "https://github.com/mozilla-releng/staging-firefox-translations-training" && head_branch[:15] == "refs/heads/dev-")))
               || (isPullRequest && pullRequestAction in ["opened", "reopened", "synchronize"])
           then:
               $let:
@@ -126,7 +115,7 @@ tasks:
                   routes:
                       $flatten:
                           - checks
-                          - $if: 'level == "3"'
+                          - $if: '!isPullRequest'
                             then:
                               - tc-treeherder.v2.${project}.${head_sha}
                           - $switch:
@@ -184,8 +173,6 @@ tasks:
                               # `taskgraph decision` are all on the command line.
                               $merge:
                                   - ${normProjectUpper}_BASE_REPOSITORY: '${baseRepoUrl}'
-                                    ${normProjectUpper}_BASE_REF: '${base_ref}'
-                                    ${normProjectUpper}_BASE_REV: '${base_sha}'
                                     ${normProjectUpper}_HEAD_REPOSITORY: '${repoUrl}'
                                     ${normProjectUpper}_HEAD_REF: '${head_ref}'
                                     ${normProjectUpper}_HEAD_REV: '${head_sha}'
@@ -239,8 +226,6 @@ tasks:
                                         --repository-type=git
                                         --tasks-for='${tasks_for}'
                                         --base-repository='${baseRepoUrl}'
-                                        --base-ref='${base_ref}'
-                                        --base-rev='${base_sha}'
                                         --head-repository='${repoUrl}'
                                         --head-ref='${head_ref}'
                                         --head-rev='${head_sha}'