Use the --digestfile flag

.github/workflows/release-container-image.yml

@@ -45,13 +45,8 @@ jobs:
           gunzip -c share/container.tar.gz | podman load
           FINAL_IMAGE_NAME="${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}"
           podman tag dangerzone.rocks/dangerzone "$FINAL_IMAGE_NAME"
-          podman push "$FINAL_IMAGE_NAME"
-
-          # Get digest of the pushed image using the final name
-          DIGEST=$(podman inspect --format='{{.Digest}}' "$FINAL_IMAGE_NAME")
-          podman inspect --format='Repo Digest: {{index .RepoDigests 0}}' "$FINAL_IMAGE_NAME"
-          echo "Digest: ${DIGEST}"
-          echo "digest=${DIGEST}" >> "$GITHUB_OUTPUT"
+          podman push "$FINAL_IMAGE_NAME" --digestfile=digest
+          echo "digest=$(cat digest)" >> "$GITHUB_OUTPUT"
 
       - name: Generate artifact attestation
         uses: actions/attest-build-provenance@v1