Preinstalled gems base image (#2208)

* Builds from baseimage with gems preinstalled

* Checks for changes in Gemfile

* Different conditional steps for build dockerfile selection

* Builds new latest gems base image if new gems are added to master

.github/workflows/build_baseimage_with_gems.yml

@@ -0,0 +1,32 @@
+name: build baseimage with gems
+
+on:
+
+  push:
+    branches:
+      - master
+    paths:
+      - "Gemfile"
+      - "Gemfile.lock"
+
+jobs:
+
+  build:
+
+    runs-on: ubuntu-20.04
+
+    steps:
+
+      - uses: actions/checkout@v2
+
+      - name: Login to container registry
+        env:
+          PASSWORD: ${{ secrets.GHCR }}
+        run: |
+          echo $PASSWORD | docker login ghcr.io -u eisbot --password-stdin
+
+      - name: Build new image with gems
+        run: |
+          docker build --no-cache -t ghcr.io/internetee/registry:gems-latest -f Dockerfile.gems .
+          docker push ghcr.io/internetee/registry:gems-latest
+

.github/workflows/build_deploy_staging.yml

@@ -26,6 +26,32 @@ jobs:
 
       - uses: actions/checkout@v2
 
+      - name: Check if there are gem updates
+        id: gem-updates-check
+        uses: tj-actions/changed-files@aae164d51be780a235cdeea89752bbacbbfee3c3
+        with:
+          files: |
+            Gemfile
+            Gemfile.lock
+
+      - name: Login to container registry
+        env:
+          PASSWORD: ${{ secrets.GHCR }}
+        run: |
+          echo $PASSWORD | docker login ghcr.io -u eisbot --password-stdin
+
+      - name: No changes in gems
+        # feature branch has no changes in gems
+        if: steps.gem-updates-check.outputs.any_changed == 'false'
+        run: |
+         echo "DOCKERFILE=Dockerfile.preinstalled_gems" >> $GITHUB_ENV
+
+      - name: Gems are changed
+        # feature branch has new/updated gems
+        if: steps.gem-updates-check.outputs.any_changed == 'true'
+        run: |
+         echo "DOCKERFILE=Dockerfile.generic" >> $GITHUB_ENV
+
       - name: Set image tag
         run: |
           SHORT_SHA=$(echo $GITHUB_SHA | cut -c 1-7) #pr-s test commit of merged state
@@ -55,7 +81,7 @@ jobs:
         env:
           KEY_BASE: ${{ secrets.KEY_BASE}}
         run: |
-          docker build -t $TAG --build-arg RAILS_ENV=staging --build-arg SECRET_KEY_BASE="$KEY_BASE" -f Dockerfile.generic .
+          docker build -t $TAG --build-arg RAILS_ENV=staging --build-arg SECRET_KEY_BASE="$KEY_BASE" -f $DOCKERFILE .
 
       - name: Clone epp_proxy project
         run: |
@@ -82,10 +108,7 @@ jobs:
           docker build -t $PROXY_TAG -f Dockerfile.release .
 
       - name: Push Docker image to gh container registry
-        env:
-          PASSWORD: ${{ secrets.GHCR }}
         run: |
-          echo $PASSWORD | docker login ghcr.io -u eisbot --password-stdin
           docker push $TAG
           docker push $PROXY_TAG