Update CODEOWNERS

 * _Only_ use groups
 * Remove devops in favor  of core-tech-release/core-tech-devx
 * Add core-tech-dbsync
 * Remove now-defunct nix-shell.project

Author: sgillespie

CODEOWNERS

@@ -1,21 +1,21 @@
 # General reviewers per PR
-#                       Erik
-*                       @erikd
-*                       @kderme
+* @input-output-hk/core-tech-dbsync
 
 # Specific reviewers for code pieces
 # NB - The last matching pattern takes precedence
 
 # /doc folder and README.* needs to be owned by @docs-access
-doc                          @input-output-hk/docs-access
-Readme.*                     @input-output-hk/docs-access
+doc                          @input-output-hk/docs-access @input-output-hk/core-tech-dbsync
+Readme.*                     @input-output-hk/docs-access @input-output-hk/core-tech-dbsync
+CONTRIBUTING.rst             @input-output-hk/docs-access @input-output-hk/core-tech-dbsync
 
-.buildkite                   @input-output-hk/devops
-.github                      @input-output-hk/devops
-config                       @input-output-hk/devops
-nix                          @input-output-hk/devops
-*.nix                        @input-output-hk/devops
-bors.toml                    @input-output-hk/devops
-nix-shell.project            @input-output-hk/devops
-docker-compose.yml           @input-output-hk/devops
-scripts/postgresql-setup.sh  @input-output-hk/devops
+# DevOps
+.buildkite                   @input-output-hk/core-tech-devx @input-output-hk/core-tech-release
+.github                      @input-output-hk/core-tech-devx @input-output-hk/core-tech-release
+config                       @input-output-hk/core-tech-devx @input-output-hk/core-tech-release
+nix                          @input-output-hk/core-tech-devx @input-output-hk/core-tech-release
+*.nix                        @input-output-hk/core-tech-devx @input-output-hk/core-tech-release
+flake.lock                   @input-output-hk/core-tech-devx @input-output-hk/core-tech-release
+bors.toml                    @input-output-hk/core-tech-devx @input-output-hk/core-tech-release
+docker-compose.yml           @input-output-hk/core-tech-devx @input-output-hk/core-tech-release
+scripts/postgresql-setup.sh  @input-output-hk/core-tech-devx @input-output-hk/core-tech-release