RM testnet workflow and rename tags to unstable (#26)

Author: sergerad

.github/CODEOWNERS

@@ -1,6 +1,6 @@
 # Lines starting with '#' are comments.
 # Each line is a file pattern followed by one or more owners.
 
-.github/workflows/              @immutable/prodsec @sergerad @rzmahmood @EdwardJES @jp-imx
-.github/actions/                @immutable/prodsec @sergerad @rzmahmood @EdwardJES @jp-imx
+.github/workflows/              @immutable/prodsec @sergerad @drinkcoffee @ermyas @jp-imx @ipekt @wcgcyx
+.github/actions/                @immutable/prodsec @sergerad @drinkcoffee @ermyas @jp-imx @ipekt @wcgcyx
 ./                              @sergerad @drinkcoffee @ermyas @jp-imx @ipekt @wcgcyx

.github/workflows/main.yaml

@@ -20,7 +20,7 @@ jobs:
           REPOSITORY_NAME="$(echo '${{ github.repository }}' | awk -F '/' '{print $2}')"
           BUILD_TIMESTAMP="$(date +%s)"
           SHORT_SHA="$(git rev-parse --short HEAD)"
-          echo TAGS="ghcr.io/${{ github.repository }}/immutable-geth:develop-$BUILD_TIMESTAMP-git.$SHORT_SHA" >> $GITHUB_ENV
+          echo TAGS="ghcr.io/${{ github.repository }}/immutable-geth:unstable-$BUILD_TIMESTAMP-git.$SHORT_SHA" >> $GITHUB_ENV
 
       - uses: ./.github/actions/push
         with: