add action.yml, python script + workflows

Author: Akshay Kalia

.github/workflows/test_action.yaml

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+# .github/workflow/test_action.yaml
+name: Test Action
+on: [push]
+
+jobs:
+  get-num-square:
+    runs-on: ubuntu-latest
+    name: Return's the number square
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Fetch num squared
+				id: get_square
+				uses: ./ # Uses an action in the root directory
+        # or use a released Github Action
+				# uses: shipyard/github-action/fetch-shipyard-env@1.0.0
+				with:
+			    num: 11
+      - name: Print the square
+        run: echo "${{ steps.get_square.outputs.num_squared }}"

action.yml

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+# action.yaml
+name: 'Custom Github Action'
+description: 'A Github Action that takes an input and returns the square of the number'
+inputs:
+  num:
+    description: 'Enter a number'
+    required: true
+    default: "1"
+outputs:
+  num_squared:
+    description: 'Square of the input'
+    # need to specify the extra `value` field for `composite` actions
+    value: ${{ steps.get-square.outputs.num_squared }}
+runs:
+  using: 'composite'
+  steps:
+    - name: Install Python
+      uses: actions/setup-python@v4
+      with:
+        python-version: '3.10'
+    - name: Install Dependencies
+      run: pip install -r requirements.txt
+      shell: bash
+    - name: Pass Inputs to Shell
+      run: |
+          echo "INPUT_NUM=${{ inputs.num }}" >> $GITHUB_ENV
+      shell: bash
+    - name: Fetch the number's square
+      id: get-square
+      run: python src/get_num_square.py
+      shell: bash

requirements.txt

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+pytest

src/get_num_square.py

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+# src/get_num_square.py
+import os
+
+# get the input and convert it to int
+num = os.environ.get("INPUT_NUM")
+if num:
+    try:
+        num = int(num)
+    except Exception:
+        exit('ERROR: the INPUT_NUM provided ("{}") is not an integer'.format(num))
+else:
+    num = 1
+
+# to set output, print to shell in following syntax
+print(f"::set-output name=num_squared::{num^2}")