Add LocMapper action

locmapper/Dockerfile

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+# This Dockerfile is used to create a proxy for Github actions.
+FROM happn/locmapper

locmapper/README.md

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+# LocMapper action
+
+## Basic usage
+
+```yaml
+name: LocMapper
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: happn-tech/actions/locmapper@master
+        with:
+          command: 'lint'
+```
+
+## Inputs
+
+| Name               | Type             | Description                                                                   |  Default  | Required |
+| ------------------ | ---------------- | ----------------------------------------------------------------------------- | --------  | -------- |
+| command            | string           | Default command                                                               |           | -        |

locmapper/action.yml

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+name: 'LocMapper'
+description: GitHub Action for using
+inputs:
+  command:
+    description: 'Default input command'
+    required: true
+runs:
+  using: 'docker'
+  image: 'Dockerfile'
+  args:
+    - ${{ inputs.command }}