Build Clio with CentOS 7

.github/actions/lint/action.yml

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+runs:
+  using: composite
+  steps:
+    # Github's ubuntu-20.04 image already has clang-format-11 installed
+    - run: |
+        find src unittests -type f \( -name '*.cpp' -o -name '*.h' -o -name '*.ipp' \) -print0 | xargs -0 clang-format-11 -i
+      shell: bash
+
+    - name: Check for differences
+      id: assert
+      shell: bash
+      run: |
+        git diff --color --exit-code | tee "clang-format.patch"

.github/actions/sign/action.yml

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+name: 'Sign packages'
+runs:
+  using: "composite"
+
+  steps:
+    - name: Sign
+      shell: bash
+      run: |
+        set -ex -o pipefail
+        echo "$GPG_KEY_B64"| base64 -d | gpg --batch --no-tty --allow-secret-key-import --import -
+        unset GPG_KEY_B64
+        export GPG_PASSPHRASE=$(echo $GPG_KEY_PASS_B64 | base64 -di)
+        unset GPG_KEY_PASS_B64
+        export GPG_KEYID=$(gpg --with-colon --list-secret-keys | head -n1 | cut -d : -f 5)
+        for PKG in $(ls *.deb); do
+          dpkg-sig \
+            -g "--no-tty --digest-algo 'sha512' --passphrase '${GPG_PASSPHRASE}' --pinentry-mode=loopback" \
+                  -k "${GPG_KEYID}" \
+                  --sign builder \
+                  $PKG
+        done

.github/actions/test/Dockerfile

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+FROM cassandra:4.0.4
+
+RUN apt-get update && apt-get install -y postgresql
+COPY entrypoint.sh /entrypoint.sh
+
+ENTRYPOINT ["/entrypoint.sh"]

.github/actions/test/entrypoint.sh

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+#!/bin/bash
+
+pg_ctlcluster 12 main start
+su postgres -c"psql -c\"alter user postgres with password 'postgres'\""
+su cassandra -c "/opt/cassandra/bin/cassandra -R"
+sleep 90
+chmod +x ./clio_tests
+./clio_tests