add Git stuff

jenkins/.env

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+JENKINS_HOME_PATH=/home/soenke/docker-data/jenkins/jenkins_sandbox_home 
+JENKINS_AGENT_SSH_PUBLIC_KEY="<< leave empty for now >>"

jenkins/README.md

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+# Jenkins with Docker Compose
+
+Jenkins docker compose file (and instructions) to configure your jenkins controller and agent.
+
+## Configuring Jenkins
+
+1. Create the **jenkins_home** folder in your local environment
+
+   ```
+   mkdir jenkins_sandbox_home
+   ```
+
+2. Create a file named **.env** and add the following:
+
+   ```yml
+   JENKINS_HOME_PATH=/home/user/jenkins_sandbox_home # your local jenkins_home path.
+   JENKINS_AGENT_SSH_PUBLIC_KEY=<< leave empty for now >>
+   ```
+
+3. Run Jenkins controller:
+
+   ```bash
+   docker-compose up -d
+   ```
+
+4. Get the password to proceed installation:
+
+   ```bash
+   docker logs jenkins_sandbox | less
+   ```
+
+5. Go to <http://localhost:8080/> and enter the password.
+
+6. Select **Install Suggested Plugins**, create the **admin** user and password, and leave the Jenkins URL <http://localhost:8080/>.
+
+## Configuring Jenkins Agent
+
+1. Use ssh-keygen to create a new key pair:
+
+   ```bash
+   ssh-keygen -t rsa -f jenkins_key
+   ```
+
+2. Go to Jenkins and click **Manage jenkins** > **Manage credentials**.
+
+3. Under **Stores scoped to Jenkins**, click **Global credentials**, next click **Add credentials** and set the following options:
+
+   - Select **SSH Username with private key**.
+   - Limit the scope to **System**.
+   - Give the credential an **ID**.
+   - Provide a **description**.
+   - Enter a **username**.
+   - Under Private Key check **Enter directly**.
+   - Paste the content of private key in the text box.
+
+4. Click **Ok** to save.
+
+5. Paste the public key on the **JENKINS_AGENT_SSH_PUBLIC_KEY** variable, in the **.env** file.
+
+6. Recreate the services:
+
+   ```bash
+   docker-compose down
+   docker-compose up -d
+   ```

jenkins/docker-compose.yml

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+# Jenkins Sandbox
+version: "3"
+services:
+  jenkins:
+    image: jenkins/jenkins:lts
+    container_name: jenkins_sandbox
+    privileged: true
+    user: root
+    ports:
+      - 8040:8080
+      - 50000:50000
+    volumes:
+      - ${JENKINS_HOME_PATH}:/var/jenkins_home
+      - /var/run/docker.sock:/var/run/docker.sock
+  agent:
+    image: jenkins/ssh-agent:jdk11
+    container_name: jenkins_sandbox_agent
+    privileged: true
+    user: root
+    expose:
+      - 22
+    environment:
+      - JENKINS_AGENT_SSH_PUBKEY=${JENKINS_AGENT_SSH_PUBLIC_KEY}