✨ Extends version matching with quotes and - annotated tags"

In this commit I added support to match the version when it is enclosed
in quotes (Example: REVIEWDOG_VERSION = "v0.1.0"). I also added support
for version tags that contain a - annotation text (example: REVIEWDOG=v0.1.0-nightly20201208+12faa31).
You can check out the regex syntax on https://regex101.com/r/t1JcmL/10.

.gitignore

@@ -0,0 +1,4 @@
+# Files to ignore
+
+# Folders to ignore
+.vscode/

Dockerfile

@@ -1,6 +1,6 @@
 FROM alpine:3.10
 
-RUN apk --no-cache add git jq curl grep coreutils
+RUN apk --no-cache add git jq curl grep coreutils perl
 
 COPY entrypoint.sh /entrypoint.sh
 

entrypoint.sh

@@ -10,7 +10,7 @@ REPO="${INPUT_REPO:-reviewdog/reviewdog}"
 VERSION_NAME="${INPUT_VERSION_NAME:-REVIEWDOG_VERSION}"
 
 # Get current version.
-CURRENT_VERSION=$(grep -oP "${VERSION_NAME}(=|:?\s+)v?\K\d+\.\d+(\.\d+)?" "${FILE}" | head -n1)
+CURRENT_VERSION=$(grep -oP "${VERSION_NAME}(?:\s?=\s?|:?\s+)\"?v?\K\d+\.\d+(\.\d+)?(-[^\"\s]*)?" "${FILE}" | head -n1)
 if [ -z "${CURRENT_VERSION}" ]; then
   echo "cannot parse ${VERSION_NAME}"
   exit 1
@@ -45,7 +45,7 @@ if [ "${CURRENT_VERSION}" = "${LATEST_VERSION}" ]; then
 fi
 
 echo "Updating ${VERSION_NAME} to ${LATEST_VERSION} in ${FILE}"
-sed -i "s/\(${VERSION_NAME}\(=\|:\?\s\+\)v\?\)\([0-9]\+\.[0-9]\+\(\.\?[0-9]\+\)\?\)/\1${LATEST_VERSION}/" "${FILE}"
+perl -i -pe "s/${VERSION_NAME}(?:\s?=\s?|:?\s+)\"?v?\K\d+\.\d+(\.\d+)?(-[^\"\s]*)?/${LATEST_VERSION}/g" "${FILE}"
 
 echo "Updated. Commit and create Pull-Request as you need."
 echo "::set-output name=current::${CURRENT_VERSION}"