Create main.yml Workflow

.github/workflows/main.yml

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+# This is a basic workflow to help you get started with Actions
+
+name: CI
+
+# Controls when the action will run. Triggers the workflow on push or pull request
+# events but only for the master branch
+on:
+  push:
+    branches: 
+      - master 
+      - github-actions
+  pull_request:
+    branches: 
+      - master
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  create-image:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2 # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+    
+    - name: Login to Dockerhub
+      run: echo ${{secrets.DOCKERHUB_PASSWORD}} | docker login -u ${{secrets.DOCKERHUB_USER}} --password-stdin
+    
+    - name: Build the image
+      run: docker build -t ${{secrets.DOCKERHUB_USER}}/kali-basic .
+    
+    - name: Upload image
+      run: docker push ${{secrets.DOCKERHUB_USER}}/kali-basic