Reinstate custom docker build.

.github/workflows/docker.yml

@@ -1,20 +1,37 @@
-name: Docker Build & Push
-
-on: [push]
-
+name: Docker
+on: [push, pull_request]
 jobs:
-
-  build-and-push:
+  build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v1
-      name: Check out code
-
-    - uses: mr-smithers-excellent/docker-build-push@feature/add-build-args
-      name: Build & push Docker image
+    - name: Checkout repo
+      uses: actions/checkout@v1
+    - name: Set up Python 3.7
+      uses: actions/setup-python@v1
       with:
-        image: 'nipreps/dmriprep'
-        registry: 'docker.io'
-        buildArgs: 'VERSION=1.0,BUILD_DATE=2020-01-08'
-        username: ${{ secrets.DOCKER_USERNAME }}
-        password: ${{ secrets.DOCKER_PASSWORD }}
+        python-version: '3.7'
+    - name: Build docker image
+      run: |
+            # Get version, update files.
+            THISVERSION=$( python get_version.py )
+            if [[ ${THISVERSION:0:2} == "0+" ]] ; then
+              echo "WARNING: latest git tag could not be found"
+              echo "Please, make sure you fetch all tags from upstream with"
+              echo "the command ``git fetch --tags --verbose`` and push"
+              echo "them to your fork with ``git push origin --tags``"
+            fi
+            # Build docker image
+            e=1 && for i in {1..5}; do
+              docker build --rm \
+                -t nipreps/dmriprep:latest \
+                --build-arg BUILD_DATE=`date -u +"%Y-%m-%dT%H:%M:%SZ"` \
+                --build-arg VCS_REF=`git rev-parse --short HEAD` \
+                --build-arg VERSION="${CIRCLE_TAG:-$THISVERSION}" . \
+              && e=0 && break || sleep 15
+            done && [ "$e" -eq "0" ]
+    - name: Push docker image
+      if: startsWith(github.event.ref, 'refs/tags') || startsWith(github.event.ref, 'docker/') || github.event.pull_request.merged == true
+      run: |
+        docker login -u ${{ secrets.DOCKER_USERNAME }} -p ${{ secrets.DOCKER_PASSWORD }}
+        docker tag nipreps/dmriprep nipreps/dmriprep:${{ github.sha }}
+        docker push nipreps/dmriprep:$${{ github.sha }}