Add publication of mainnet stack images

.gitea/workflows/publish-mainnet-laconicd-images.yml

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+name: Publish Laconicd Mainnet Stack Container Images
+
+# Note: images in this stack have the same name as images in the fixturenet stack
+# beware that at present they are not distinguished. So publishing a new version
+# of one of those images will lead to it being consumed by the other stack.
+
+on:
+  push:
+    branches: 'main'
+    paths:
+      - '!**'
+      - '.gitea/workflows/triggers/publish-mainnet-laconicd-images'
+      - '.gitea/workflows/publish-mainnet-laconicd-images.yml'
+
+jobs:
+  publish:
+    name: "Publish Laconicd Mainnet Stack Container Images"
+    runs-on: ubuntu-latest
+    steps:
+      - name: "Clone project repository"
+        uses: actions/checkout@v3
+      # At present the stock setup-python action fails on Linux/aarch64
+      # Conditional steps below workaroud this by using deadsnakes for that case only
+      - name: "Install Python for ARM on Linux"
+        if: ${{ runner.arch == 'arm64' && runner.os == 'Linux' }}
+        uses: deadsnakes/action@v3.0.1
+        with:
+          python-version: '3.8'
+      - name: "Install Python cases other than ARM on Linux"
+        if: ${{ ! (runner.arch == 'arm64' && runner.os == 'Linux') }}
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.8'
+      - name: "Print Python version"
+        run: python3 --version
+      - name: "Install stack orchestrator"
+        run: ./scripts/install-so.sh
+      - name: "Build containers"
+        run: |
+         PATH=$PATH:~/bin
+         laconic-so --quiet --stack mainnet-laconic setup-repositories
+         laconic-so --stack mainnet-laconic build-containers         
+      - name: "Publish container images"
+        run: |
+          PATH=$PATH:~/bin
+          echo ${{ secrets.CICD_PUBLISH_TOKEN }} | docker login git.vdb.to -u cerccicd --password-stdin
+          laconic-so --stack mainnet-laconic build-containers --publish-images --image-registry git.vdb.to/cerc-io   

.gitea/workflows/triggers/publish-mainnet-laconicd-images

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+# Change this file to trigger the job publish-fixturenet-laconicd-images.yml