Send slack message tasks

slackmessage/OWNERS

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+approvers:
+- akihikokuroda
+- ncskier
+reviewers:
+- akihikokuroda
+- ncskier
+

slackmessage/README.md

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+# Post a message to slack
+
+These tasks post a simple message to a slack channel.  There are multiple ways to send
+a message to slack.  Each task here uses different method.
+
+# send-to-webhook-slack
+
+This task uses Incomming Webhooks of the slack to send the message.
+Follow instructions [here](https://api.slack.com/messaging/webhooks) to generate a webhook URL.
+
+## Install the Task and create a secret
+
+```
+kubectl apply -f https://raw.githubusercontent.com/tektoncd/catalog/master/slackmessage/send-to-webhook-slack.yaml
+```
+
+Create a secret that has the generated webhook URL
+
+Example webhook-secret.yaml
+```
+kind: Secret
+apiVersion: v1
+metadata:
+  name: webhook-secret
+stringData:
+  url: {generated webhook URL}
+```
+
+Example kubectl command
+```
+kubectl apply -f webhook-secret.yaml
+```
+
+## Inputs
+
+### Parameters
+
+* **webhook-secret**: The name of the secret that has the webhook URL.  The key for the URL is url
+
+* **message**: Plain text message to be posted in the slack channel
+
+## Usage
+
+This TaskRun runs the Task to post a message to the channel that the webhook URL is associated with.
+
+```
+apiVersion: tekton.dev/v1alpha1
+kind: TaskRun
+metadata:
+  name: run-send-to-webhook-slack
+spec:
+  inputs:
+    params:
+      - name: webhook-secret
+        value: webhook-secret
+      - name: message
+        value: "Hello from Tekton!"
+  taskRef:
+    name: send-to-webhook-slack
+
+```
+
+# send-to-channel-slack
+
+This task uses chat.postMessage slack REST api to send the message.
+Follow instructions [here](https://api.slack.com/messaging/sending) to obtain the OAuth access token for the bot app with `chat:write` scope.
+The app must join the channel before the message posted by this task run. (invite the app in the channel)
+
+## Install the Task and create a secret
+
+```
+kubectl apply -f https://raw.githubusercontent.com/tektoncd/catalog/master/slackmessage/send-to-channel-slack.yaml
+```
+
+Create a secret that has the OAuth token of the bot app.
+
+Example token-secret.yaml
+```
+kind: Secret
+apiVersion: v1
+metadata:
+  name: token-secret
+stringData:
+  token: {OAuth token for the bot app}
+```
+
+Example kubectl command
+```
+kubectl apply -f token-secret.yaml
+```
+
+## Inputs
+
+### Parameters
+
+* **token-secret**: The name of the secret that has the OAuth token.  The key for the OAuth-token is token
+
+* **channel**: [channel id](https://api.slack.com/messaging/retrieving#finding_conversation) or channel name where the message is posted
+
+* **message**: Plain text message to be posted in the slack channel
+
+## Usage
+
+This TaskRun runs the Task to post a message to the channel.
+
+```
+apiVersion: tekton.dev/v1alpha1
+kind: TaskRun
+metadata:
+  name: run-send-to-channel-slack
+spec:
+  inputs:
+    params:
+      - name: token-secret
+        value: token-secret
+      - name: channel
+        value: {CHANNEL ID}
+      - name: message
+        value: "Hello from Tekton!"
+  taskRef:
+    name: send-to-channel-slack
+
+```
+

slackmessage/send-to-channel-slack.yaml

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+apiVersion: tekton.dev/v1alpha1
+kind: Task
+metadata:
+  name: send-to-channel-slack
+spec:
+  inputs:
+    params:
+    - name: token-secret
+      type: string
+      description: seret name of the slack app access token (key is token)
+    - name: channel
+      type: string
+      description: channel id or channel name
+    - name: message
+      type: string
+      description: plain text message
+  steps:
+  - name: post
+    image: curlimages/curl:7.68.0
+    script: |
+      #!/bin/sh
+      /usr/bin/curl -X POST -H 'Content-type: application/json' -H 'Authorization: Bearer '$TOKEN --data '{"channel":"$(inputs.params.channel)", "text":"$(inputs.params.message)"}' https://slack.com/api/chat.postMessage
+    env:
+    - name: TOKEN
+      valueFrom:
+        secretKeyRef:
+          name: $(inputs.params.token-secret)
+          key: token

slackmessage/send-to-webhook-slack.yaml

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+apiVersion: tekton.dev/v1alpha1
+kind: Task
+metadata:
+  name: send-to-webhook-slack
+spec:
+  inputs:
+    params:
+    - name: webhook-secret
+      type: string
+      description: seret name of the slcak app webhook URL (key is url)
+    - name: message
+      type: string
+      description: plain text message
+  steps:
+  - name: post
+    image: curlimages/curl:7.68.0
+    script: |
+      #!/bin/sh
+      /usr/bin/curl -p X POST -H 'Content-type: application/json' --data '{"text":"$(inputs.params.message)"}' $URL
+    env:
+    - name: URL
+      valueFrom:
+        secretKeyRef:
+          name: $(inputs.params.webhook-secret)
+          key: url