Use Buildah instead of Docker and build three times a month instead of every day

.github/workflows/os.yml

@@ -1,42 +1,32 @@
 name: os
 
-# This workflow uses actions that are not certified by GitHub.
-# They are provided by a third-party and are governed by
-# separate terms of service, privacy policy, and support
-# documentation.
-
 on:
   schedule:
-    - cron: '0 5 * * *'  # 5 am every day
+    - cron: '0 5 8,18,28 * *'
   push:
     paths:
-        - 'Dockerfile'
-        - 'etc/**'
-        - 'usr/**'
-        - 'repo/**'
+      - 'Dockerfile'
+      - 'etc/**'
+      - 'usr/**'
+      - 'repo/**'
+      - '.github/workflows/os.yml'
+  workflow_dispatch:
 
 env:
-  # Use docker.io for Docker Hub if empty
   REGISTRY: ghcr.io
-  # github.repository as <account>/<repo>
   IMAGE_NAME: ${{ github.repository }}
-  IMAGE_REGISTRY: ghcr.io/${{ github.repository_owner }}
-
 
 jobs:
   build:
-
     runs-on: ubuntu-latest
     permissions:
       contents: read
       packages: write
-      # This is used to complete the identity challenge
-      # with sigstore/fulcio when running outside of PRs.
-      id-token: write
+      id-token: write # Påkrævet til cosign keyless signering
 
     steps:
       - name: Maximize build space
-        uses: AdityaGarg8/remove-unwanted-software@v1
+        uses: AdityaGarg8/remove-unwanted-software@v5
         with:
           remove-dotnet: 'true'
           remove-android: 'true'
@@ -44,71 +34,62 @@ jobs:
 
       - name: Get current date
         id: date
-        run: echo "::set-output name=date::$(date +'%Y%m%d')"
-
-      - name: Test with environment variables
-        run: echo $DATE
-        env:
-          DATE: ${{ steps.date.outputs.date }}
+        run: echo "date=$(date +'%Y%m%d')" >> $GITHUB_OUTPUT
 
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
-      # Install the cosign tool except on PR
-      # https://github.com/sigstore/cosign-installer
-      - name: Install cosign
-        if: github.event_name != 'pull_request'
-        uses: sigstore/cosign-installer@6e04d228eb30da1757ee4e1dd75a0ec73a653e06 #v3.1.1
-        with:
-          cosign-release: 'v2.1.1'
-
-      # Workaround: https://github.com/docker/build-push-action/issues/461
-      - name: Setup Docker buildx
-        uses: docker/setup-buildx-action@79abd3f86f79a9d68a23c75a09a9a85889262adf
-
-      # Login against a Docker registry except on PR
-      # https://github.com/docker/login-action
-      - name: Log into registry ${{ env.REGISTRY }}
-        if: github.event_name != 'pull_request'
-        uses: docker/login-action@28218f9b04b4f3f62068d7b6ce6ca5b26e35336c
-        with:
-          registry: ${{ env.REGISTRY }}
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
-
-      # Extract metadata (tags, labels) for Docker
-      # https://github.com/docker/metadata-action
       - name: Extract Docker metadata
         id: meta
-        uses: docker/metadata-action@98669ae865ea3cffbcbaa878cf57c20bbf1c6c38
+        uses: docker/metadata-action@v5
         with:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          # Vi konstruerer tags her med branch-navnet som præfiks
+          tags: |
+            type=ref,event=branch
+            type=raw,value=latest,enable={{is_default_branch}}
+            type=raw,value=${{ github.ref_name }}-10
+            type=raw,value=${{ github.ref_name }}-10.${{ steps.date.outputs.date }}
 
-      # Build and push Docker image with Buildx (don't push on PR)
-      # https://github.com/docker/build-push-action
-      - name: Build and push Docker image
-        id: build-and-push
-        uses: docker/build-push-action@ac9327eae2b366085ac7f6a2d02df8aa8ead720a
-        with:
-          context: .
-          push: ${{ github.event_name != 'pull_request' }}
-          tags: ${{ steps.meta.outputs.tags }}, ${{ steps.meta.outputs.tags }}-10, ${{ steps.meta.outputs.tags }}-10.${{ steps.date.outputs.date }}
-       #   labels: ${{ steps.meta.outputs.labels }}
-          cache-from: type=gha
-          cache-to: type=gha,mode=max
+      - name: Log into GHCR
+        if: github.event_name != 'pull_request'
+        run: |
+          buildah login -u ${{ github.actor }} -p ${{ secrets.GITHUB_TOKEN }} ${{ env.REGISTRY }}
 
+      - name: Build image with Buildah
+        id: build-image
+        run: |
+          # Vi bygger med 'raw-img' lokalt
+          buildah bud \
+            --label "org.opencontainers.image.source=https://github.com/${{ github.repository }}" \
+            -t raw-img .
 
-      # Sign the resulting Docker image digest except on PRs.
-      # This will only write to the public Rekor transparency log when the Docker
-      # repository is public to avoid leaking data.  If you would like to publish
-      # transparency data even for private images, pass --force to cosign below.
-      # https://github.com/sigstore/cosign
-      - name: Sign the published Docker image
-        if: ${{ github.event_name != 'pull_request' }}
-        env:
-          # https://docs.github.com/en/actions/security-guides/security-hardening-for-github-actions#using-an-intermediate-environment-variable
-          TAGS: ${{ steps.meta.outputs.tags }}
-          DIGEST: ${{ steps.build-and-push.outputs.digest }}
-        # This step uses the identity token to provision an ephemeral certificate
-        # against the sigstore community Fulcio instance.
-        run: echo "${TAGS}" | xargs -I {} cosign sign --yes {}@${DIGEST}
+          # Gem det primære tag til signering (vi tager det første fra listen)
+          PRIMARY_TAG=$(echo "${{ steps.meta.outputs.tags }}" | head -n 1)
+          echo "primary_tag=$PRIMARY_TAG" >> $GITHUB_OUTPUT
+
+      - name: Push to GHCR
+        if: github.event_name != 'pull_request'
+        run: |
+          for tag in $(echo "${{ steps.meta.outputs.tags }}"); do
+            echo "Tagging and pushing: $tag"
+            buildah tag raw-img "$tag"
+            buildah push "$tag"
+          done
+
+      - name: Install cosign
+        if: github.event_name != 'pull_request'
+        uses: sigstore/cosign-installer@v3.3.0
+
+      # VI TILFØJER LOGIN TIL COSIGN HER
+      - name: Log into GHCR (Cosign)
+        if: github.event_name != 'pull_request'
+        run: |
+          cosign login ${{ env.REGISTRY }} -u ${{ github.actor }} -p ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Sign image
+        if: github.event_name != 'pull_request'
+        run: |
+          # Vi signerer det primære tag.
+          # Vi bruger --yes til at acceptere betingelserne automatisk.
+          cosign sign --yes "${{ steps.build-image.outputs.primary_tag }}"