ci(): adding github action files

Dockerfile

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+FROM golang:1.13
+WORKDIR /src
+COPY . .
+ENV GO111MODULE=on
+RUN go build -o /bin/dusti-lock
+COPY entrypoint.sh /entrypoint.sh
+ENTRYPOINT ["/entrypoint.sh"]

action.yml

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+name: 'DustiLock'
+description: 'Scanning project dependencies - checks if one or more is available for public registration'
+inputs:
+  recursive:
+    description: 'scan recursively (default = false)'
+    required: false
+    default: ''
+  path:
+    description: 'custom scan dir (e.g. "subdir1/subdir2")'
+    required: false
+    default: ''
+  audit:
+    description: 'disable failing the build when having alerts (default = false)'
+    required: false
+    default: ''
+runs:
+  using: 'docker'
+  image: 'Dockerfile'
+branding:
+  icon: 'edit'
+  color: 'yellow'

entrypoint.sh

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+#!/bin/sh -l
+
+export SCAN_PATH="/github/workspace/"
+export ARGS=""
+
+if [ -n "$INPUT_RECURSIVE" ]; then
+    export ARGS="$ARGS -r"
+fi
+
+if [ -n "$INPUT_AUDIT" ]; then
+    export ARGS="$ARGS -a"
+fi
+
+if [ -n "$INPUT_PATH" ]; then
+    export SCAN_PATH="$SCAN_PATH$INPUT_PATH"
+fi
+
+/bin/dusti-lock -p $SCAN_PATH$ARGS