new: notify slack channel

- using alpine:3.16 base image
- using jq as json parser
- doc: CHANGELOG.md available

CHANGELOG.md

@@ -14,5 +14,5 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 - `entrypoint.sh` has been updated according to the new parameters
-- `Dockerfile` is using new version of `curlimages/curl:7.84.0`
+- `Dockerfile` is using `alpine:3.16` as base image
 - `README.md` has been updated and simplified

README.md

@@ -12,7 +12,7 @@ This action wraps the Slack [chat.postMessage](https://api.slack.com/methods/cha
 - name: Notify Slack
   env:
     SLACK_BOT_TOKEN: ${{ secrets.SLACK_BOT_TOKEN }} # required
-  uses: rainui28/notify-slack-action@master
+  uses: rainui28/notify-slack-action@<tag>
   with:
     channel-id: <slack-channel-id> # required
     text: <text-to-post> # required
@@ -30,6 +30,8 @@ Here's what the Slack message would look like:
 | channel-id      | x            | string   | Channel where message will be posted |
 | text            | x            | string   | Message to post in the channel       |
 
+**You can find available action's tags [here](https://github.com/rainui28/notify-slack-action/tags)**
+
 ## References
 
 - [Slack's documentation](https://api.slack.com/docs/messages)

entrypoint.sh

@@ -40,6 +40,6 @@ if [ $is_ok == 'true' ]
 then 
   echo "* Slack channel id '$1' has been notified with '$2'"
 else
-  log_error "`echo $response | jq '.error'`"
+  log_error "SLACK_BOT_ERROR: `echo $response | jq '.error'`"
 fi
 exit 0