Add hint to Dockerfile's that they are generated

docker/Dockerfile.j2

@@ -1,3 +1,6 @@
+{{ "# This file was generated using a Jinja2 template." }}
+{{ "# Please make your changes in `Dockerfile.j2` and then `make` the individual Dockerfile's." }}
+
 # Using multistage build:
 # 	https://docs.docker.com/develop/develop-images/multistage-build/
 # 	https://whitfin.io/speeding-up-rust-docker-builds/

docker/aarch64/mysql/Dockerfile

@@ -1,3 +1,6 @@
+# This file was generated using a Jinja2 template.
+# Please make your changes in `Dockerfile.j2` and then `make` the individual Dockerfile's.
+
 # Using multistage build:
 # 	https://docs.docker.com/develop/develop-images/multistage-build/
 # 	https://whitfin.io/speeding-up-rust-docker-builds/

docker/aarch64/sqlite/Dockerfile

@@ -1,3 +1,6 @@
+# This file was generated using a Jinja2 template.
+# Please make your changes in `Dockerfile.j2` and then `make` the individual Dockerfile's.
+
 # Using multistage build:
 # 	https://docs.docker.com/develop/develop-images/multistage-build/
 # 	https://whitfin.io/speeding-up-rust-docker-builds/

docker/amd64/mysql/Dockerfile

@@ -1,3 +1,6 @@
+# This file was generated using a Jinja2 template.
+# Please make your changes in `Dockerfile.j2` and then `make` the individual Dockerfile's.
+
 # Using multistage build:
 # 	https://docs.docker.com/develop/develop-images/multistage-build/
 # 	https://whitfin.io/speeding-up-rust-docker-builds/

docker/amd64/mysql/Dockerfile.alpine

@@ -1,3 +1,6 @@
+# This file was generated using a Jinja2 template.
+# Please make your changes in `Dockerfile.j2` and then `make` the individual Dockerfile's.
+
 # Using multistage build:
 # 	https://docs.docker.com/develop/develop-images/multistage-build/
 # 	https://whitfin.io/speeding-up-rust-docker-builds/

docker/amd64/postgresql/Dockerfile

@@ -1,3 +1,6 @@
+# This file was generated using a Jinja2 template.
+# Please make your changes in `Dockerfile.j2` and then `make` the individual Dockerfile's.
+
 # Using multistage build:
 # 	https://docs.docker.com/develop/develop-images/multistage-build/
 # 	https://whitfin.io/speeding-up-rust-docker-builds/

docker/amd64/postgresql/Dockerfile.alpine

@@ -1,3 +1,6 @@
+# This file was generated using a Jinja2 template.
+# Please make your changes in `Dockerfile.j2` and then `make` the individual Dockerfile's.
+
 # Using multistage build:
 # 	https://docs.docker.com/develop/develop-images/multistage-build/
 # 	https://whitfin.io/speeding-up-rust-docker-builds/

docker/amd64/sqlite/Dockerfile

@@ -1,3 +1,6 @@
+# This file was generated using a Jinja2 template.
+# Please make your changes in `Dockerfile.j2` and then `make` the individual Dockerfile's.
+
 # Using multistage build:
 # 	https://docs.docker.com/develop/develop-images/multistage-build/
 # 	https://whitfin.io/speeding-up-rust-docker-builds/

docker/amd64/sqlite/Dockerfile.alpine

@@ -1,3 +1,6 @@
+# This file was generated using a Jinja2 template.
+# Please make your changes in `Dockerfile.j2` and then `make` the individual Dockerfile's.
+
 # Using multistage build:
 # 	https://docs.docker.com/develop/develop-images/multistage-build/
 # 	https://whitfin.io/speeding-up-rust-docker-builds/

docker/armv6/mysql/Dockerfile

@@ -1,3 +1,6 @@
+# This file was generated using a Jinja2 template.
+# Please make your changes in `Dockerfile.j2` and then `make` the individual Dockerfile's.
+
 # Using multistage build:
 # 	https://docs.docker.com/develop/develop-images/multistage-build/
 # 	https://whitfin.io/speeding-up-rust-docker-builds/

docker/armv6/sqlite/Dockerfile

@@ -1,3 +1,6 @@
+# This file was generated using a Jinja2 template.
+# Please make your changes in `Dockerfile.j2` and then `make` the individual Dockerfile's.
+
 # Using multistage build:
 # 	https://docs.docker.com/develop/develop-images/multistage-build/
 # 	https://whitfin.io/speeding-up-rust-docker-builds/

docker/armv7/mysql/Dockerfile

@@ -1,3 +1,6 @@
+# This file was generated using a Jinja2 template.
+# Please make your changes in `Dockerfile.j2` and then `make` the individual Dockerfile's.
+
 # Using multistage build:
 # 	https://docs.docker.com/develop/develop-images/multistage-build/
 # 	https://whitfin.io/speeding-up-rust-docker-builds/

docker/armv7/sqlite/Dockerfile

@@ -1,3 +1,6 @@
+# This file was generated using a Jinja2 template.
+# Please make your changes in `Dockerfile.j2` and then `make` the individual Dockerfile's.
+
 # Using multistage build:
 # 	https://docs.docker.com/develop/develop-images/multistage-build/
 # 	https://whitfin.io/speeding-up-rust-docker-builds/