Update README to change Docker port from 8999 to 80 and add GitHub Ac…

…tions workflow for Docker image build

.github/workflows/docker-image.yml

@@ -0,0 +1,33 @@
+name: Build Docker Image
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v1
+
+    - name: Login to DockerHub
+      uses: docker/login-action@v1
+      with:
+        username: ${{ secrets.DOCKER_USERNAME }}
+        password: ${{ secrets.DOCKER_PASSWORD }}
+
+    - name: Build and push Docker image
+      uses: docker/build-push-action@v2
+      with:
+        context: .
+        push: true
+        tags: ${{ secrets.DOCKER_USERNAME }}/posh-rest:latest

README.md

@@ -25,10 +25,10 @@ This PowerShell script creates a RESTful API that allows remote clients to perfo
 2. Run the Docker container:
 
     ```sh
-    docker run -d -p 8999:8999 posh-rest
+    docker run -d -p 80:80 posh-rest
     ```
 
-The script will start listening for requests on port 8999.
+The script will start listening for requests on port 80.
 
 #### Without Docker