Restore debian7 images needed for beats 7.17 (#621)

Co-authored-by: Victor Martinez <victormartinezrubio@gmail.com>

Author: mauri870

.buildkite/pipeline.yml

@@ -118,6 +118,7 @@ steps:
           setup:
             makefile:
               - "Makefile"
+              - "Makefile.debian7"
               - "Makefile.debian9"
               - "Makefile.debian10"
               - "Makefile.debian11"
@@ -184,6 +185,7 @@ steps:
           setup:
             makefile:
               - "Makefile"
+              - "Makefile.debian7"
               - "Makefile.debian9"
               - "Makefile.debian10"
               - "Makefile.debian11"

.github/release-drafter.yml

@@ -48,6 +48,7 @@ template: |
   - `docker.elastic.co/beats-dev/golang-crossbuild:$RESOLVED_VERSION-base`
   - `docker.elastic.co/beats-dev/golang-crossbuild:$RESOLVED_VERSION-darwin` - darwin/amd64 (MacOS 10.11, MacOS 10.14)
   - `docker.elastic.co/beats-dev/golang-crossbuild:$RESOLVED_VERSION-main` - linux/i386, linux/amd64, windows/amd64
+  - `docker.elastic.co/beats-dev/golang-crossbuild:$RESOLVED_VERSION-main-debian7` - linux/i386, linux/amd64, windows/amd64
   - `docker.elastic.co/beats-dev/golang-crossbuild:$RESOLVED_VERSION-main-debian9` - linux/i386, linux/amd64, windows/amd64
   - `docker.elastic.co/beats-dev/golang-crossbuild:$RESOLVED_VERSION-main-debian10` - linux/i386, linux/amd64, windows/amd64
   - `docker.elastic.co/beats-dev/golang-crossbuild:$RESOLVED_VERSION-main-debian11` - linux/i386, linux/amd64, windows/amd64

Makefile

@@ -9,6 +9,7 @@ build:
 	@echo '0' > ${status}
 	@$(foreach var,$(TARGETS), \
 		$(MAKE) -C $(var) $@ || echo '1' > ${status}; \
+		$(MAKE) -C $(var) -f Makefile.debian7 $@ || echo '1' > ${status}; \
 		$(MAKE) -C $(var) -f Makefile.debian9 $@ || echo '1' > ${status}; \
 		$(MAKE) -C $(var) -f Makefile.debian10 $@ || echo '1' > ${status}; \
 		$(MAKE) -C $(var) -f Makefile.debian11 $@ || echo '1' > ${status}; \
@@ -31,6 +32,7 @@ push:
 	@echo '0' > ${status}
 	@$(foreach var,$(TARGETS), \
 		$(MAKE) -C $(var) $@ || echo '1' > ${status}; \
+		$(MAKE) -C $(var) -f Makefile.debian7 $@ || echo '1' > ${status}; \
 		$(MAKE) -C $(var) -f Makefile.debian9 $@ || echo '1' > ${status}; \
 		$(MAKE) -C $(var) -f Makefile.debian10 $@ || echo '1' > ${status}; \
 		$(MAKE) -C $(var) -f Makefile.debian11 $@ || echo '1' > ${status}; \

README.md

@@ -119,6 +119,7 @@ it triggers the build of all Docker images for all architectures and Debian vers
 The file `go/Makefile.common` is the default Makefile used to build the Docker images for the different architectures.
 There is additional Makefile for each Debian version that is used to build the Docker images for that Debian version.
 
+* `go/Makefile.debian7`
 * `go/Makefile.debian9`
 * `go/Makefile.debian10`
 * `go/Makefile.debian11`

go/Makefile.debian7

@@ -0,0 +1,14 @@
+IMAGES         := base main
+DEBIAN_VERSION := 7
+TAG_EXTENSION  := -debian7
+
+export DEBIAN_VERSION TAG_EXTENSION
+
+build:
+	@$(foreach var,$(IMAGES),$(MAKE) -C $(var) build || exit 1;)
+
+# Requires login at https://docker.elastic.co:7000/.
+push:
+	@$(foreach var,$(IMAGES),$(MAKE) -C $(var) push || exit 1;)
+
+.PHONY: build push