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README.md

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+# Build Workflow
+
+This is a workflow designed to automate the process of building and pushing Docker images to the registry. The workflow is triggered through the `workflow_call` event, allowing it to be reused in other workflows or repositories.
+
+## Usage Example
+
+In this example, the `build` workflow is invoked with a custom `tag`, `username`, and `password`. The workflow will build and push a Docker image using the provided parameters.
+
+```yaml
+jobs:
+  build:
+    uses: your-repo/.github/workflows/build.yml@main
+    with:
+      tag: v1.0.0
+      username: my-docker-username
+      password: ${{ secrets.DOCKER_PASSWORD }}
+```
+
+### Input Parameters
+- **tag** (optional):
+    - **Type:** `string`
+    - **Default:** `latest`
+    - **Description:** Tag to be assigned to the Docker image. If not provided, it defaults to `latest`.
+
+- **username** (optional):
+    - **Type:** `string`
+    - **Default:** `${{ vars.REGISTRY_USERNAME }}`
+    - **Description:** Username for the Docker registry authentication. Defaults to authenticated `registry` user.
+
+- **password** (optional):
+    - **Type:** `string`
+    - **Default:** `${{ vars.REGISTRY_PASSWORD }}`
+    - **Description:** Password for the Docker registry authentication. Defaults to authenticated `registry` user.
+
+### Steps
+
+1. **Checkout Code:**
+    - **Action:** `actions/checkout@v4`
+    - **Description:** This step checks out the code from the repository, ensuring the latest version of the code is available for building the Docker image.
+
+2. **Login to Docker Registry:**
+    - **Action:** `docker/login-action@v3`
+    - **Description:** Logs into the Docker registry (`git.qlic.nl`) using the provided `username` and `password` inputs.
+    - **Inputs:**
+        - `registry`: Set to `git.qlic.nl`
+        - `username`: Provided via `${{ inputs.username }}`
+        - `password`: Provided via `${{ inputs.password }}`
+
+3. **Build Docker Image:**
+    - **Command:**
+      ```bash
+      docker build . -t ${{ vars.REGISTRY }}/${{ gitea.repository }}:${{ inputs.tag }} -t ${{ vars.REGISTRY }}/${{ gitea.repository }}:${{ gitea.sha }}
+      ```
+    - **Description:** Builds a Docker image from the current code. The image is tagged with both the user-provided `tag` (or the default `latest` if not provided) and the current Git commit SHA.
+
+4. **Push Docker Image:**
+    - **Command:**
+      ```bash
+      docker push ${{ vars.REGISTRY }}/${{ gitea.repository }} --all-tags
+      ```
+    - **Description:** Pushes the built Docker image to the Docker registry (`git.qlic.nl`), ensuring that all tags are pushed.