> ## Documentation Index
> Fetch the complete documentation index at: https://notes.kodekloud.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Using a Docker Action in Workflow
> Learn to import and run a Docker-based GitHub Action to post GIF responses on pull requests automatically.
Learn how to import and run a Docker-based GitHub Action from one repository in another. In this guide, we’ll reuse the `docker-action-pr-giphy-comment` action in the **solar-system** project to automatically post a GIF response on pull requests.
## 1. Switch to the Target Repository
Open the **solar-system** repository where you want to integrate the custom action.
## 2. Store Your Giphy API Key
To fetch GIFs, the action requires a Giphy API key stored as a secret.
1. Navigate to **Settings → Secrets and variables → Actions**.
2. Click **New repository secret**.
3. Name it `GIPHY_API_KEY` and paste your API key.
Never expose your API keys in code or logs. Repository secrets are encrypted and only available to workflows.
## 3. Create a Pull Request Workflow
Under `.github/workflows/`, add a new file named `pr-thank-you-workflow.yml`:
```yaml theme={null}
on:
pull_request:
types:
- opened
jobs:
pr-action:
runs-on: ubuntu-latest
permissions:
issues: write
pull-requests: write
steps:
- name: Post GIF Comment
uses: sidd-harth-7/docker-action-pr-giphy-comment@main
with:
github-token: ${{ secrets.GITHUB_TOKEN }}
giphy-api-key: ${{ secrets.GIPHY_API_KEY }}
```
Replace `sidd-harth-7/docker-action-pr-giphy-comment@main` with your own `owner/repo@branch` reference.
### Job Configuration
| Setting | Value |
| ----------- | --------------------------------------- |
| runs-on | `ubuntu-latest` |
| permissions | `issues: write`, `pull-requests: write` |
Commit to a new branch and open a pull request:
## 4. Monitor the Workflow Execution
Head to the **Actions** tab to see your workflow run.
### Example Build Logs
Docker container actions build an image at runtime:
```bash theme={null}
# Build container for action use: '/home/runner/work/_actions/sidd-harth-7/docker-action-pr-giphy-comment/main/Dockerfile'.
#1 [internal] load .dockerignore
#1 transferring context: 2B done
#1 DONE 0.0s
#2 [internal] load build definition from Dockerfile
#2 transferring dockerfile: 448B done
#2 DONE 0.0s
#3 [internal] load metadata for docker.io/library/alpine:3.10
#3 DONE 0.0s
#6 [1/4] FROM docker.io/library/alpine:3.10@sha256:...
#6 DONE 0.1s
#9 [4/4] RUN chmod +x /entrypoint.sh
#9 DONE 0.3s
```
Then the container runs:
```bash theme={null}
/usr/bin/docker run --name 2d046f464e14829be2791b519b_32bdb \
--label 461cec \
--workdir /github/workspace \
-e "INPUT_GITHUB_TOKEN=" \
-e "INPUT_GIPHY_API_KEY=" \
--rm \
-v /home/runner/work/... \
...
```
Continuous Docker builds can introduce latency. Consider using a [JavaScript action](/docs/actions/creating-actions/about-actions#javascript-actions) for faster startup.
## 5. Confirm the GIF Comment
After success, your pull request will display a “Thank you” comment with a GIF:
***
## Links and References
* [GitHub Actions Documentation](https://docs.github.com/actions)
* [Creating a Docker Container Action](https://docs.github.com/actions/creating-actions/creating-a-docker-container-action)
* [Giphy Developer API](https://developers.giphy.com/docs/)