Add a new tasks for updating bugbug hook (#289)

The hook will be responsible for starting the data pipeline, but right now is
doing mostly nothing.

Use taskboot new command `build-hook` to update the hook based on the
versioned definition file.

.gitignore

@@ -27,3 +27,4 @@ share/python-wheels/
 .installed.cfg
 *.egg
 MANIFEST
+cache/

.taskcluster.yml

@@ -237,3 +237,36 @@ tasks:
             description: bugbug docker push
             owner: ${user}@users.noreply.github.com
             source: ${repository}/raw/${head_rev}/.taskcluster.yml
+
+      - $if: 'tasks_for == "github-push" && head_branch[:10] == "refs/tags/"'
+        then:
+          taskId: {$eval: as_slugid("update_hook")}
+          dependencies:
+            - {$eval: as_slugid("docker_push")}
+          scopes:
+            - hooks:modify-hook:project-relman/bugbug
+            - assume:hook-id:project-relman/bugbug
+          created: {$fromNow: ''}
+          deadline: {$fromNow: '1 hour'}
+          provisionerId: aws-provisioner-v1
+          workerType: github-worker
+          payload:
+            features:
+              taskclusterProxy:
+                true
+            maxRunTime: 3600
+            image: mozilla/taskboot:latest
+            env:
+              GIT_REPOSITORY: ${repository}
+              GIT_REVISION: ${head_rev}
+            command:
+              - taskboot
+              - build-hook
+              - infra/taskcluster-hook-pipeline-start.json
+              - project-relman
+              - bugbug
+          metadata:
+            name: bugbug update hooks
+            description: bugbug update hooks
+            owner: ${user}@users.noreply.github.com
+            source: ${repository}/raw/${head_rev}/.taskcluster.yml

infra/taskcluster-hook-pipeline-start.json

@@ -0,0 +1,59 @@
+{
+    "schedule": [
+        "0 0 * * * *"
+    ],
+    "metadata": {
+        "description": "",
+        "name": "BugBug data pipeline",
+        "owner": "mcastelluccio@mozilla.com"
+    },
+    "task": {
+        "created": {
+            "$fromNow": "0 seconds"
+        },
+        "deadline": {
+            "$fromNow": "2 hours"
+        },
+        "expires": {
+            "$fromNow": "1 month"
+        },
+        "extra": {},
+        "metadata": {
+            "description": "",
+            "name": "BugBug data pipeline",
+            "owner": "mcastelluccio@mozilla.com",
+            "source": "https://github.com/mozilla/bugbug"
+        },
+        "payload": {
+            "artifacts": {},
+            "cache": {},
+            "capabilities": {},
+            "command": [
+                "/hello"
+            ],
+            "env": {},
+            "features": {
+                "taskclusterProxy": true
+            },
+            "image": "hello-world",
+            "maxRunTime": 7200
+        },
+        "priority": "normal",
+        "provisionerId": "aws-provisioner-v1",
+        "retries": 5,
+        "routes": [
+            "notify.email.release-mgmt-analysis@mozilla.com.on-failed",
+            "notify.irc-channel.#bugbug.on-failed"
+        ],
+        "schedulerId": "-",
+        "scopes": [
+            "assume:hook-id:project-relman/bugbug"
+        ],
+        "tags": {},
+        "workerType": "taskcluster-generic"
+    },
+    "triggerSchema": {
+        "additionalProperties": true,
+        "type": "object"
+    }
+}