Fix release notes script to use fixed tags

Author: msau42

generate_patch_release_notes.sh renamed to generate-patch-release-notes.sh

@@ -48,7 +48,7 @@ function gen_patch_relnotes() {
   rm out.md || true
   rm -rf /tmp/k8s-repo || true
   GITHUB_TOKEN="$CSI_RELEASE_TOKEN" \
-  release-notes --discover=patch-to-latest --branch="$2" \
+  release-notes --start-rev="$3" --end-rev="$2" --branch="$2" \
     --org=kubernetes-csi --repo="$1" \
     --required-author="" --markdown-links --output out.md
 }
@@ -57,11 +57,14 @@ for rel in "${releases[@]}"; do
   read -r repo version <<< "$rel"
 
   # Parse minor version
-  minorPattern="(^[[:digit:]]+\.[[:digit:]]+)\."
-  [[ "$version" =~ $minorPattern ]]
+  minorPatchPattern="(^[[:digit:]]+\.[[:digit:]]+)\.([[:digit:]]+)"
+  [[ "$version" =~ $minorPatchPattern ]]
   minor="${BASH_REMATCH[1]}"
+  patch="${BASH_REMATCH[2]}"
 
-  echo "$repo" "$version" "$minor"
+  echo "$repo $version $minor $patch"
+  prevPatch="$((patch-1))"
+  prevVer="v$minor.$prevPatch"
 
   pushd "$repo/CHANGELOG"
 
@@ -74,7 +77,7 @@ for rel in "${releases[@]}"; do
   git checkout --track "upstream/release-$minor" -b "$branch"
 
   # Generate release notes
-  gen_patch_relnotes "$repo" "release-$minor"
+  gen_patch_relnotes "$repo" "release-$minor" "$prevVer"
   cat > tmp.md <<EOF
 # Release notes for v$version
 
@@ -84,6 +87,7 @@ EOF
 
   cat out.md >> tmp.md
   echo >> tmp.md
+  rm out.md
 
   file="CHANGELOG-$minor.md"
   cat "$file" >> tmp.md