Use xpath instead of xmllint to parse current Swift version

Author: marcprux

action.yml

@@ -147,8 +147,14 @@ runs:
         # fetch the Atom feed for the latest releases
         curl -fsSL --retry 8 --retry-connrefused https://github.com/skiptools/swift-android-toolchain/releases.atom --output ${{ runner.temp }}/swift-releases.xml
         SWIFT_VERSIONS_FILE=${{ runner.temp }}/swift-versions.txt
+
         #yq -oy '.feed.entry[].title' ${{ runner.temp }}/swift-releases.xml | sort -rn > ${SWIFT_VERSIONS_FILE}
-        xmllint --xpath "/*[local-name()='feed']/*[local-name()='entry']/*[local-name()='title']/text()"  ${{ runner.temp }}/swift-releases.xml | sort -rn > ${SWIFT_VERSIONS_FILE}
+        #xmllint --xpath "/*[local-name()='feed']/*[local-name()='entry']/*[local-name()='title']/text()" ${{ runner.temp }}/swift-releases.xml | sort -rn > ${SWIFT_VERSIONS_FILE}
+        xpath -q -e '/feed/entry/title/text()' ${{ runner.temp }}/swift-releases.xml | sort -rn > ${SWIFT_VERSIONS_FILE}
+
+        # yq or xmllint are best for this, but they aren't installed by
+        # default on GH Linux runners, we we just use grep
+        #grep '<title>' swift-releases.xml | cut -f 2 -d '>' | cut -f 1 -d '<' | grep '^[0-9]' ${{ runner.temp }}/swift-releases.xml | sort -rn > ${SWIFT_VERSIONS_FILE}
 
         # if we hardcode the latest builds, we would need to update them every time a new snapshot is released