Add our own upload-artifact and download-artifact actions.

These compress the artifacts prior to calling the official
`{upload,download}-artifact` actions in order to preserve permissions
and symlinks.

Signed-off-by: Pedro Algarvio <palgarvio@vmware.com>

.github/actions/download-artifact/action.yml

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+# This actions was inspired by https://github.com/alehechka/download-tartifact
+---
+name: Download Tar Artifact
+description: >
+  Download and extract a tar artifact that was previously uploaded in the
+  workflow by the upload-tartifact action
+
+inputs:
+  name:
+    description: Artifact name
+    required: false
+  path:
+    description: Destination path
+    required: false
+  archive-name:
+    description: >
+      By default `inputs.name`(last resort, `archive`) is what's used to name the archive.
+      This parameter allows a customizing that archive name. This will allow uploading multiple
+      archives under the same 'name', like the underlying official action does
+      without overriding the existing archives.
+    required: false
+
+runs:
+  using: composite
+  steps:
+    - uses: actions/download-artifact@v3
+      with:
+        name: ${{ inputs.name }}
+        path: ${{ inputs.path }}
+
+    - shell: bash
+      working-directory: ${{ inputs.path }}
+      run: |
+        tar -xvf ${{ inputs.archive-name || inputs.name || 'archive' }}.tar.gz
+
+    - shell: bash
+      working-directory: ${{ inputs.path }}
+      run: |
+        rm -f ${{ inputs.archive-name || inputs.name || 'archive' }}.tar.gz

.github/actions/upload-artifact/action.yml

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+# This actions was inspired by https://github.com/alehechka/upload-tartifact
+---
+name: Upload Tar Artifact
+description: Compress files with tar prior to artifacting to keep file privileges.
+
+inputs:
+  name:
+    description: Artifact name
+    default: artifact
+    required: false
+  path:
+    description: >
+      A file, directory or wildcard pattern that describes what to upload.
+      Note: The path provided will be maintained through tar, so after
+      download-tartifact, and subfolder structure will remain intact.
+    required: true
+  if-no-files-found:
+    description: >
+      The desired behavior if no files are found using the provided path.
+      Available Options:
+        warn: Output a warning but do not fail the action
+        error: Fail the action with an error message
+        ignore: Do not output any warnings or errors, the action does not fail
+    default: 'warn'
+    required: false
+  retention-days:
+    description: >
+      Duration after which artifact will expire in days. 0 means using default retention.
+      Minimum 1 day.
+      Maximum 90 days unless changed from the repository settings page.
+    required: false
+  archive-name:
+    description: >
+      By default `archive` is what's used to name the archive. This parameter
+      allows a customizing that archive name. This will allow uploading multiple
+      archives under the same 'name', like the underlying official action does
+      without overriding the existing archives.
+    required: false
+
+runs:
+  using: composite
+  steps:
+    - shell: bash
+      run: |
+        shopt -s globstar || echo "'globstar' not available"
+        tar -cavf ${{ inputs.archive-name || inputs.name || 'archive' }}.tar.gz ${{ inputs.path }}
+
+    - uses: actions/upload-artifact@v3
+      with:
+        name: ${{ inputs.name }}
+        path: ${{ inputs.archive-name || inputs.name || 'archive' }}.tar.gz
+        if-no-files-found: ${{ inputs.if-no-files-found }}
+        retention-days: ${{ inputs.retention-days }}
+
+    - shell: bash
+      run: |
+        rm -f ${{ inputs.archive-name || inputs.name || 'archive' }}.tar.gz