ci: correctly fetch image on nightly image ref (#3276)

Signed-off-by: Daniel Weiße <dw@edgeless.systems>

.github/actions/select_image/action.yml

@@ -3,15 +3,15 @@ description: Resolve string presets and shortpaths to shortpaths only
 
 inputs:
  osImage:
- description: "Shortpath or main-debug or release-stable"
+ description: "Shortpath, main-debug, main-nightly, or release-stable"
  required: true
 
 outputs:
  osImage:
- description: "Shortpath of for input string, original input if that was already a shortpath"
+ description: "Shortpath of input string, original input if that was already a shortpath"
  value: ${{ steps.set-output.outputs.osImage }}
  isDebugImage:
- description: "Input represents a debug image or not"
+ description: "Input is a debug image or not"
  value: ${{ steps.set-output.outputs.isDebugImage }}
 
 runs:
@@ -27,7 +27,7 @@ runs:
  id: input-is-preset
  shell: bash
  run: |
- if [[ "${{ inputs.osImage }}" == "ref/main/stream/debug/?" || "${{ inputs.osImage }}" == "ref/release/stream/stable/?" ]]; then
+ if [[ "${{ inputs.osImage }}" == "ref/main/stream/debug/?" || "${{ inputs.osImage }}" == "ref/main/stream/nightly/?" || "${{ inputs.osImage }}" == "ref/release/stream/stable/?" ]]; then
  echo "result=true" | tee -a "$GITHUB_OUTPUT"
  else
  echo "result=false" | tee -a "$GITHUB_OUTPUT"