Add: self-hosted-runner-cache-mount (#1593)

Author: pascalholthaus

self-hosted-runner-cache-mount/README.md

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+# Self-Hosted Runner Cache Mount
+ 
+- Mount a cache directory on your self-hosted runner
+
+#### Use Case
+ 
+```yaml
+jobs:
+  cache-mount:
+    name: Cache mount on self-hosted runner
+    runs-on: ubuntu-latest
+    steps:
+      - ...
+      - name: Mount Cache
+        uses: greenbone/actions/self-hosted-runner-cache-mount@v3
+      - ...
+``` 
+## Action Configuration
+ 
+| Input Variable | Description                                                              | Default Value         |
+| ---------------| ------------------------------------------------------------------------ | --------------------- |
+| server         | NFS Server IP/Domain to mount.                                           | 10.0.0.1              |
+| path           | Mount Path on the runner where the cache will be mounted. FULL PATH!     | /repository-cache     |

self-hosted-runner-cache-mount/action.yaml

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+name: Self-Hosted Runner Cache Mount
+description: A GitHub Action to mount a cache directory on your self-hosted runner.
+
+inputs:
+  server:
+    description: "NFS Server IP/Domain. Default is 10.0.0.1."
+    default: "10.0.0.1"
+  path:
+    description: "Mount Path(FULL PATH). Default is /repository-cache"
+    default: "/repository-cache"
+
+branding:
+  icon: "package"
+  color: "green"
+
+runs:
+  using: "composite"
+  steps:
+    - name: Mount Cache
+      shell: bash
+      run: |
+        root_path='/var/lib/runner-cache'
+        sudo apt update
+        sudo apt install nfs-common -y
+        sudo mkdir -p "$root_path"
+        sudo mount -t nfs -o vers=4,sec=sys ${{ inputs.server }}:/ "$root_path"
+        sudo mkdir -p "$root_path/${{ github.repository }}"
+        sudo mkdir -p '${{ inputs.path }}'
+        sudo mount --bind "$root_path/${{ github.repository }}" '${{ inputs.path }}'
+        sudo umount "$root_path"