Replace Elixir 1.17 with 1.18 for build unit-testing pipelines

.gitlab-ci.yml

@@ -79,12 +79,12 @@ build-1.14.5-otp-25:
   script:
   - mix compile --force
 
-build-1.17.1-otp-26:
+build-1.18.3-otp-27:
   extends:
   - .build_changes_policy
   - .using-ci-base
   stage: build
-  image: git.pleroma.social:5050/pleroma/pleroma/ci-base:elixir-1.17.1-otp-26
+  image: git.pleroma.social:5050/pleroma/pleroma/ci-base:elixir-1.18.3-otp-27
   script:
   - mix compile --force
 
@@ -142,12 +142,12 @@ unit-testing-1.14.5-otp-25:
         coverage_format: cobertura
         path: coverage.xml
 
-unit-testing-1.17.1-otp-26:
+unit-testing-1.18.3-otp-27:
   extends:
   - .build_changes_policy
   - .using-ci-base
   stage: test
-  image: git.pleroma.social:5050/pleroma/pleroma/ci-base:elixir-1.17.1-otp-26
+  image: git.pleroma.social:5050/pleroma/pleroma/ci-base:elixir-1.18.3-otp-27
   cache: *testing_cache_policy
   services: *testing_services
   script: *testing_script

ci/elixir-1.18.3-otp-27/Dockerfile

@@ -0,0 +1,8 @@
+FROM elixir:1.18.3-otp-27
+
+# Single RUN statement, otherwise intermediate images are created
+# https://docs.docker.com/develop/develop-images/dockerfile_best-practices/#run
+RUN apt-get update &&\
+	apt-get install -y libmagic-dev cmake libimage-exiftool-perl ffmpeg &&\
+	mix local.hex --force &&\
+	mix local.rebar --force

ci/elixir-1.18.3-otp-27/build_and_push.sh

@@ -0,0 +1 @@
+docker buildx build --platform linux/amd64,linux/arm64 -t git.pleroma.social:5050/pleroma/pleroma/ci-base:elixir-1.18.3-otp-27 --push .