Rebuild images only when needed

.github/workflows/build-env/action.yml

@@ -0,0 +1,91 @@
+name: Build Environment Image
+description: Build the Open MPI environment image for Fenix
+
+inputs:
+  ompi_version:
+    description: "Open MPI version to build"
+    type: string
+    required: true
+  token:
+    description: "GitHub token for logging into GHCR"
+    type: string
+    required: true
+  max_age:
+    description: "Maximum image age before rebuild, in days"
+    type: number
+    required: false
+    default: 14
+
+runs:
+  using: "composite"
+  steps:
+    - name: Check for valid image
+      shell: bash
+      run: |
+        set +e
+        IMG=ghcr.io/sandialabs/fenix/env:${{ inputs.ompi_version }}
+        echo "IMG=$IMG" >> $GITHUB_ENV
+
+        docker image rm -f $IMG 2>/dev/null
+        docker pull $IMG >/dev/null 2>&1
+        IMG_CREATED=$(docker inspect --type=image --format '{{.Created}}' $IMG 2>/dev/null)
+        if [ -z "$IMG_CREATED" ]; then
+          echo "Did not find image $IMG"
+          echo "found=false" >> $GITHUB_ENV
+          exit 0
+        fi
+
+        IMG_AGE=$(( ($(date +%s) - $(date -d "$IMG_CREATED" +%s)) / (60*60*24) ))
+        echo "Found image $IMG created $IMG_AGE days ago"
+        if [ "$IMG_AGE" -lt ${{ inputs.max_age }} ]; then
+          echo "Image is valid, skipping build"
+          echo "found=true" >> $GITHUB_ENV
+        else
+          echo "Image is too old, rebuilding"
+          echo "found=false" >> $GITHUB_ENV
+        fi
+
+      #Remaining actions only run if we didn't find a valid image.
+    - name: Checkout repository
+      if: env.found != 'true'
+      uses: actions/checkout@v3
+
+    - name: Set up Docker Buildx
+      if: env.found != 'true'
+      uses: docker/setup-buildx-action@v2
+
+    - name: Log in to GHCR container registry
+      if: env.found != 'true'
+      uses: docker/login-action@v3
+      with:
+        registry: ghcr.io
+        username: ${{ github.actor }}
+        password: ${{ inputs.token }}
+
+    - name: Bake the bootstrap docker image
+      if: env.found != 'true'
+      uses: docker/bake-action@v5
+      with:
+        files: .github/docker-compose.yml
+        targets: bootstrap
+        workdir: .
+        set: |
+          *.output=type=docker,name=bootstrap
+          *.args.OMPI_VERSION=${{ inputs.ompi_version }}
+
+    - name: Bootstrap the environment Dockerfile
+      if: env.found != 'true'
+      shell: bash
+      run: docker run -v ${GITHUB_WORKSPACE}/.github:/configs bootstrap
+
+    - name: Build the environment
+      if: env.found != 'true'
+      uses: docker/bake-action@v5
+      with:
+        files: .github/docker-compose.yml
+        targets: env
+        workdir: .
+        pull: true
+        set: |
+          env.tags=ghcr.io/sandialabs/fenix/env:${{ inputs.ompi_version }}
+          env.output=type=registry,name=ghcr.io/sandialabs/fenix/env:${{ inputs.ompi_version }}

.github/workflows/ci_checks.yaml

@@ -1,12 +1,7 @@
 name: Build & Test
 
 on:
-  push:
-  pull_request_target:
-    types:
-      - opened
-      - synchronized
-      - edited
+  pull_request:
 
 jobs:
   test:
@@ -19,54 +14,24 @@ jobs:
           - 5.0.3
 
     steps:
-      - name: Checkout repository
+      - name: Checkout
         uses: actions/checkout@v3
 
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v2
-
-      - name: Log in to GHCR container registry
-        uses: docker/login-action@v3
+      - name: Build the environment image
+        uses: ./.github/workflows/build-env
         with:
-          registry: ghcr.io
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
+          ompi_version: ${{ matrix.ompi_version }}
+          token: ${{ secrets.GITHUB_TOKEN }}
+          max_age: 14 #days
 
-      - name: Bake the bootstrap docker image
-        uses: docker/bake-action@v5
-        with:
-          files: .github/docker-compose.yml
-          targets: bootstrap
-          workdir: .
-          set: |
-            *.output=type=docker,name=bootstrap
-            *.cache-from=type=gha,scope=bootstrap/${{ matrix.ompi_version }}
-            *.cache-to=type=gha,mode=max,scope=bootstrap/${{ matrix.ompi_version }}
-            *.args.OMPI_VERSION=${{ matrix.ompi_version }}
-
-      - name: Bootstrap the environment Dockerfile
-        run: docker run -v ${GITHUB_WORKSPACE}/.github:/configs bootstrap
-
-      - name: Build the environment
-        uses: docker/bake-action@v5
-        with:
-          files: .github/docker-compose.yml
-          targets: env
-          workdir: .
-          pull: true
-          set: |
-            *.cache-from=type=gha,scope=env/${{ matrix.ompi_version }}
-            *.cache-to=type=gha,mode=max,scope=env/${{ matrix.ompi_version }}
-            env.tags=ghcr.io/sandialabs/fenix/env:${{ matrix.ompi_version }}
-            env.output=type=registry,name=ghcr.io/sandialabs/fenix/env:${{ matrix.ompi_version }}
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
 
       - name: Build Fenix
         uses: docker/bake-action@v5
         with:
-          source: .
           files: .github/docker-compose.yml
           targets: fenix
-          workdir: .
           set: |
             *.output=type=docker,name=fenix
             *.args.OMPI_VERSION=${{ matrix.ompi_version }}