feat(get-composer-version): create new action (#145)

This creates a new A Github Action that determines the currently installed version of Composer.

Co-authored-by: Vitaliy Golomoziy <vitaliy.golomoziy@gmail.com>

get-composer-version/README.md

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+# "Get Composer Version" Action
+
+A Github Action that computes an installed Composer version.
+
+## Inputs
+
+See the [action.yml](./action.yml)
+
+## Usage
+
+```yml
+name: Get Composer Version
+
+on:
+  push:
+    branches:
+    - main
+  pull_request:
+    branches:
+    - main
+
+jobs:
+  version:
+    runs-on: ubuntu-latest
+    name: A job to compute an installed Composer version.
+    steps:
+      - uses: actions/checkout@v3
+      - uses: mage-os/github-actions/get-composer-version@main
+        id: get-composer-version
+      - run: echo version ${{ steps.get-composer-version.outputs.version }}
+        shell: bash
+```

get-composer-version/action.yml

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+name: "Get Composer Version"
+author: "Graycore"
+description: " A Github Action that determines the currently installed version of Composer"
+
+outputs:
+  version: # id of output
+    description: 'The determined version of Composer'
+    value: ${{ steps.get-composer-version.outputs.version }}
+
+runs:
+  using: "composite"
+  steps:
+  - run: echo "version=$(composer --version | awk '{print $3}')" >> $GITHUB_OUTPUT
+    shell: bash
+    name: Compute Installed Composer version
+    id: get-composer-version
+
+branding:
+  icon: "code"
+  color: "green"