Fix rrd-antlr4 parse error: strip unsupported element option before processing

rrd-antlr4 uses an older ANTLR4 meta-grammar that doesn't support the
< assoc = right > element option. Strip it with sed before passing the
grammar to the tool; the diagram is still accurate without it.

Made-with: Cursor

Author: dbenn

.github/workflows/daily-release.yml

@@ -66,7 +66,11 @@ jobs:
         git clone --depth 1 https://github.com/bkiers/rrd-antlr4.git /tmp/rrd-antlr4
         mvn -q clean package -f /tmp/rrd-antlr4/pom.xml
         cd /tmp/rrd-antlr4/target
-        java -jar rrd-antlr4-0.1.2.jar --pdf "$GITHUB_WORKSPACE/src/org/aavso/tools/vstar/vela/VeLa.g4"
+        # rrd-antlr4 uses an older ANTLR4 meta-grammar that doesn't support
+        # element options (< assoc = right >), so strip them before processing.
+        sed 's/<[[:space:]]*assoc[[:space:]]*=[[:space:]]*right[[:space:]]*>//' \
+          "$GITHUB_WORKSPACE/src/org/aavso/tools/vstar/vela/VeLa.g4" > /tmp/VeLa-rrd.g4
+        java -jar rrd-antlr4-0.1.2.jar --pdf /tmp/VeLa-rrd.g4
         find output -name "*.pdf" -exec cp {} "$GITHUB_WORKSPACE/VeLa-railroad.pdf" \;
     - uses: pyTooling/Actions/releaser@r0
       with: