feat: quick and dirty github step to install nightly mojo

.github/workflows/test.yml

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+name: Test Setup Mojo Action
+
+on: [push]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Mojo
+      uses: ./
+      with:
+        version: '2024.7.1805'
+    - name: Verify Mojo installation
+      run: |
+        mojo --version
+        echo "Modular Home: $MODULAR_HOME"

README.md

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+# Github Action for setting up Mojo
+
+Quick and dirty Github Action for setting up Mojo.
+
+Usage:
+
+```yaml
+name: Test Setup Mojo Action
+
+on: [push]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Setup Mojo
+      uses: kszucs/setup-mojo@latest
+      with:
+        version: '2024.7.1805'
+    - name: Verify Mojo installation
+      run: |
+        mojo --version
+        echo "Modular Home: $MODULAR_HOME"
+```
+
+TODOs:
+- [ ] Prefix the installation path with the version
+- [ ] Bake in caching to speed up the installation
+- [ ] Test other platforms

action.yml

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+name: 'Setup Mojo'
+description: 'Set up Mojo language'
+inputs:
+  version:
+    description: 'The Mojo version to install'
+    required: true
+runs:
+  using: 'composite'
+  steps:
+    - run: ./setup-mojo.sh ${{ inputs.version }}
+      shell: bash

setup-mojo.sh

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+set -e
+
+VERSION=$1
+
+curl -s https://get.modular.com | sh -
+
+modular auth test
+modular install nightly/mojo --install-version $VERSION
+
+echo "MODULAR_HOME=/home/runner/.modular" >> $GITHUB_ENV
+echo "PATH=$PATH:/home/runner/.modular/pkg/packages.modular.com_nightly_mojo/bin" >> $GITHUB_ENV