chore: target 3.1.* + connected simplification

* global.json sdk value will now match 3.1.whatever
* rm the now-redundant sed both from the ci pipeline and Dockerfile*
* limit ci pipeline runs to single build for an event. e.g. on a pr,
  run a single build instead of both a pr build and a push build
* edit Makefile to force --no-cache builds

.drone.yml

@@ -7,19 +7,17 @@ platform:
   os: linux
   arch: amd64
 
-steps:
-- name: sed-tgt-version
-  pull: always
-  image: bash
-  commands:
-    - sed -i 's/3.1.110/3.1.404/' global.json
-    # since we're running 3.1.404 here in the CI, this is necessary
+trigger:
+  ref:
+  - refs/heads/master
+  - refs/heads/feature-*
+  - refs/pull/*/head
+  - refs/tags/*
 
+steps:
 - name: debug
   pull: always
   image: mcr.microsoft.com/dotnet/core/sdk:3.1-alpine
-  depends_on:
-    - sed-tgt-version
   commands:
     - dotnet restore
     - dotnet build .
@@ -27,8 +25,6 @@ steps:
 - name: release
   pull: always
   image: mcr.microsoft.com/dotnet/core/sdk:3.1-alpine
-  depends_on:
-    - sed-tgt-version
   commands:
     - dotnet restore
     - dotnet publish -c Release -o out

Dockerfile

@@ -5,14 +5,10 @@ ENV UNAME unpriv
 RUN adduser -D -u ${UID} -g ${GID} -H ${UNAME} -h /src
 WORKDIR /src
 
-COPY global.json ./
-RUN sed -i 's/3.1.110/3.1.404/' global.json
-
 COPY *.csproj ./
 RUN dotnet restore
 
 COPY . ./
-RUN sed -i 's/3.1.110/3.1.404/' global.json
 RUN dotnet publish -c Release -o bin/out
 
 FROM mcr.microsoft.com/dotnet/aspnet:3.1

Dockerfile.dev

@@ -5,14 +5,10 @@ ENV UNAME unpriv
 RUN adduser -D -u ${UID} -g ${GID} -H ${UNAME} -h /src
 WORKDIR /src
 
-COPY global.json ./
-RUN sed -i 's/3.1.110/3.1.404/' global.json
-
 COPY *.csproj ./
 RUN dotnet restore
 
 COPY . ./
-RUN sed -i 's/3.1.110/3.1.404/' global.json
 RUN dotnet build -c Debug -o bin/out
 RUN chown -R ${UID}:${GID} ./ /root/
 USER ${UNAME}

Makefile

@@ -35,13 +35,13 @@ dockerbuild:
 	docker build \
 		--build-arg VCS_REF=`git rev-parse --short HEAD` \
 		--build-arg BUILD_DATE=`date -u +"%Y-%m-%dT%H:%M:%SZ"` \
-		-t $(dtag) -f $(dfile) .
+		-t $(dtag) -f $(dfile) --no-cache .
 
 dockerdevbuild:
 	docker build \
 		--build-arg VCS_REF=`git rev-parse --short HEAD` \
 		--build-arg BUILD_DATE=`date -u +"%Y-%m-%dT%H:%M:%SZ"` \
-		-t $(dtagdev) -f $(dfiledev) .
+		-t $(dtagdev) -f $(dfiledev) --no-cache .
 
 dockerrun:
 	@echo ======================

global.json

@@ -1,5 +1,5 @@
 {
   "sdk": {
-    "version": "3.1.404"
+    "version": "3.1.*"
   }
 }