make sure alternate GPG home is known

.github/workflows/release.yml

@@ -34,14 +34,15 @@ jobs:
 
       - name: Prepare GPG key
         run: |
-          gpg_dir=.cr-gpg
+          gpg_dir="$(pwd)/.cr-gpg"
           mkdir "$gpg_dir"
           keyring="$gpg_dir/secring.gpg"
           base64 -d <<< "$GPG_KEY_BASE64" > "$keyring"
           passphrase_file="$gpg_dir/passphrase"
           echo "$GPG_PASSPHRASE" > "$passphrase_file"
           echo "CR_PASSPHRASE_FILE=$passphrase_file" >> "$GITHUB_ENV"
           echo "CR_KEYRING=$keyring" >> "$GITHUB_ENV"
+          echo "GNUPGHOME=${gpg_dir}"
         env:
           GPG_KEY_BASE64: "${{ secrets.GPG_KEY_BASE64 }}"
           GPG_PASSPHRASE: "${{ secrets.GPG_PASSPHRASE }}"