[StepSecurity] Apply security best practices (#44)

Signed-off-by: StepSecurity Bot <bot@stepsecurity.io>
Co-authored-by: John Mertic <jmertic@linuxfoundation.org>

Author: step-security-bot

.github/workflows/update-release-version.yml

@@ -4,6 +4,9 @@ on:
   release:
     types: [published]
 
+permissions:
+  contents: read
+
 jobs:
   update-readme:
     runs-on: ubuntu-latest

Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3-alpine
+FROM python:3-alpine@sha256:05b2b8b732ecd268fee8727a369f936f022d1321b59befd13c30ede22769dcdc
 
 WORKDIR /action