Revert to use deprecated set-output for the time being

Author: sormuras

action.yml

@@ -50,11 +50,13 @@ runs:
         DOWNLOAD=$GITHUB_ACTION_PATH/src/Download.java
         if [ ! -z "${{ inputs.uri }}" ]; then
           $JAVA \
+            -DeprecatedSetOutput=true \
             -Dinstall-as-version="${{ inputs.install-as-version }}" \
             $DOWNLOAD \
             ${{ inputs.uri }}
         else
           $JAVA \
+            -DeprecatedSetOutput=true \
             -Dinstall-as-version="${{ inputs.install-as-version }}" \
             $DOWNLOAD \
             ${{ inputs.website }} \

src/Download.java

@@ -230,6 +230,10 @@ Optional<String> findRemoteChecksum(String checksum) throws Exception {
   static class GitHub {
     /** Sets an action's output parameter. */
     static void setOutput(String name, Object value) {
+      if (Boolean.getBoolean(/*-D*/ "eprecatedSetOutput")) {
+        System.out.printf("::set-output name=%s::%s%n", name, value);
+        return;
+      }
       if (name.isBlank() || value.toString().isBlank()) { // implicit null checks included
         throw new IllegalArgumentException("name or value are blank: " + name + "=" + value);
       }
@@ -244,6 +248,7 @@ static void setOutput(String name, Object value) {
         if (lines.size() != 1) {
           throw new UnsupportedOperationException("Multiline strings are no supported");
         }
+        debug("Write output %s to %s".formatted(lines, file));
         Files.write(file, lines, UTF_8, CREATE, APPEND, WRITE);
       } catch (IOException exception) {
         throw new UncheckedIOException(exception);