[ITEP-68209] Add parsing of version.txt for rc version for build (#236)

## 📝 Description

This PR adds parsing logic for release candidate (RC) versions from
version.txt file in the build workflow. It modifies the weekly build
workflow to handle RC versions differently by using the version.txt
content directly as the image tag when it contains "rc".

Key Changes:

- Added error handling when version.txt file is not found
- Added conditional logic to detect RC versions and use them directly as
image tags
- Modified existing tag generation logic to accommodate RC version
handling

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## ✨ Type of Change

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- [ ] 🐞 **Bug fix** – Non-breaking change which fixes an issue
- [ ] 🚀 **New feature** – Non-breaking change which adds functionality
- [ ] 🔨 **Refactor** – Non-breaking change which refactors the code base
- [ ] 💥 **Breaking change** – Changes that break existing functionality
- [ ] 📚 **Documentation update**
- [ ] 🔒 **Security update**
- [ ] 🧪 **Tests**
- [ ] 🚂 **CI**

## 🧪 Testing Scenarios

Describe how the changes were tested and how reviewers can test them
too:

- [ ] ✅ Tested manually
- [ ] 🤖 Ran automated end-to-end tests

## ✅ Checklist

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- [ ] 🔍 PR title is clear and descriptive
- [ ] 📝 For internal contributors: If applicable, include the JIRA
ticket number (e.g., ITEP-123456) in the PR **title**. Do **not**
include full URLs
- [ ] 💬 I have commented my code, especially in hard-to-understand areas
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works

Author: dmytroye

.github/workflows/weekly-build.yml

@@ -60,15 +60,24 @@ jobs:
           version=""
           if [ -f version.txt ]; then
             version=v$(tr -d ' \n' < version.txt)
+          else
+            echo "version.txt not found."
+            exit 1
           fi
-          if [ "${{ github.event_name }}" == "workflow_dispatch" ]; then
-            commit_hash=$(git rev-parse --short HEAD)
-            tag="${version:+$version-}$commit_hash"
+          # If version.txt contains "rc", use its content as image tag
+          if grep -q "rc" version.txt; then
+            tag="$version"
             echo "image_tag=$tag" >> $GITHUB_OUTPUT
           else
-            date_tag=$(date -u +'%Y%m%d')
-            tag="${version:+$version-}$date_tag"
-            echo "image_tag=$tag" >> $GITHUB_OUTPUT
+            if [ "${{ github.event_name }}" == "workflow_dispatch" ]; then
+              commit_hash=$(git rev-parse --short HEAD)
+              tag="${version:+$version-}$commit_hash"
+              echo "image_tag=$tag" >> $GITHUB_OUTPUT
+            else
+              date_tag=$(date -u +'%Y%m%d')
+              tag="${version:+$version-}$date_tag"
+              echo "image_tag=$tag" >> $GITHUB_OUTPUT
+            fi
           fi
 
       - name: "Tag images"