Enable custom terraform version

.gitlab-ci.yml

 stages:
   - build
 
-docker-build:
+.compile-sources:
+  script: &compile-sources
+    - env GOOS=linux GOARCH=amd64 go build -o terraform-provider-openstack
+    - git clone --depth 1 --branch $TERRAFORM_VERSION https://github.com/hashicorp/terraform.git
+    - go env -w GOBIN="$(pwd)"/terraform
+    - cd terraform && go install && cd ..
+
+.docker-build:
   stage: build
-  image: registry.gitlab.ics.muni.cz:443/cloud/g2/container-registry/docker.io__debian:bullseye
+  image: registry.gitlab.ics.muni.cz:443/cloud/g2/container-registry/docker.io__debian:latest
+  variables:
+    TERRAFORM_VERSION: v1.5.2 # Tag from Github https://github.com/hashicorp/terraform/tree/v1.5.2
   before_script:
-    - apt-get update 1> /dev/null && apt-get install -y docker.io jq > install.log
-    - service docker start && sleep 5s
-  script:
+    - apt-get update 1> /dev/null && apt-get install -y docker.io golang-go 1> dpkg-install.log
+    - service docker start
     - PROVIDER_VERSION="$(cat VERSION)"
-    - TERRAFORM_VERSION="$(docker run hashicorp/terraform version -json | jq -r '.terraform_version')"
-
+  script:
+    - *compile-sources
     - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY
-    - docker build --no-cache -t "$CI_REGISTRY_IMAGE:v$TERRAFORM_VERSION-$PROVIDER_VERSION" .
-    - docker push "$CI_REGISTRY_IMAGE:v$TERRAFORM_VERSION-$PROVIDER_VERSION"
+    - docker build -t "$CI_REGISTRY_IMAGE:$TERRAFORM_VERSION-$PROVIDER_VERSION" .
+    - docker push "$CI_REGISTRY_IMAGE:$TERRAFORM_VERSION-$PROVIDER_VERSION"
+
+docker-build-tags:
+  extends: .docker-build
   only:
-    - master
+    - tags
+
+docker-build-manual:
+  extends: .docker-build
+  when: manual